Drinking alcohol during pregnancy can cause physical and mental birth defects. Each year, up to 40,000 babies are born with some degree of alcohol-related damage (1, 2). Although many women are aware that heavy drinking during pregnancy can cause birth defects, many do not realize that moderate—or even light—drinking also may harm the fetus.
We could fill the page with bad things that might happen. That doesn't help anyone. Some people believe a few drinks a week is all right. But the bul...

Drinking alcohol during pregnancy can cause physical and mental birth defects. Each year, up to 40,000 babies are born with some degree of alcohol-related damage (1, 2). Although many women are aware that heavy drinking during pregnancy can cause birth defects, many do not realize that moderate—or even light—drinking also may harm the fetus.
We could fill the page with bad things that might happen. That doesn't help anyone. Some people believe a few drinks a week is all right. But the bulk of the evidence is against that. It is just a roll of the dice.
A pregnant woman who has already consumed alcohol during her pregnancy should stop in order to minimize further risk.
And good for you for being concerned enough to stop.

I think you should see a doctor about it. Things are possible but it isnt definite that your baby will be affected

The best thing you can do now is keep all your appts with your obstetrician and make sure he/she is aware of your drinking and definetley stay away from the adult beverages now. Lots of women drink up until they find out they are pregnant and all is well with the baby. Just make sure that you take your vitamins and do everything you can no to promaote your baby's well being

Even Light Drinking While Pregnant Can Be Harmful:

Prenatal Exposure Affects Learning, Memory
Many people know about the dangers of prenatal alcohol exposure, particularly the damaging effects that heavy drinking can cause to a child's cognitive development. A study published in the March 2004 issue of Alcoholism: Clinical & Experimental Research has found that even light to moderate dr...

Even Light Drinking While Pregnant Can Be Harmful:

Prenatal Exposure Affects Learning, Memory
Many people know about the dangers of prenatal alcohol exposure, particularly the damaging effects that heavy drinking can cause to a child's cognitive development. A study published in the March 2004 issue of Alcoholism: Clinical & Experimental Research has found that even light to moderate drinking during pregnancy may interfere with learning and memory during adolescence.

"We have known for a long time that drinking heavily during pregnancy could lead to major impairments in growth, behavior, and cognitive function in children," said Jennifer Willford, assistant professor of psychiatry at the University of Pittsburgh School of Medicine, and the study's first author. "This paper clearly shows that even small amounts of alcohol during pregnancy can have a significant impact on child development."

"Learning and memory are cornerstones for success in school and in everyday life," added Sarah Mattson, assistant professor in the Department of Psychology, and associate director of the Center for Behavioral Teratology at San Diego State University

Disruption of the ability to learn and remember new information jeopardizes the job of children, that is, to go to school. The inability to learn new information in the verbal or nonverbal domain will interfere with a child's ability to achieve alongside his or her peers."

The data examined in this study were collected as part of the Maternal Health Practices and Child Development Project (MHPCD), an ongoing longitudinal study of 580 children and their mothers. For this study, mothers were assessed during each trimester of their pregnancies, and again with their children at regular intervals from birth to 16 years of age.

"We chose measures that would help us understand the types of learning and memory difficulties experienced by adolescents who were prenatally exposed to alcohol," explained Willford. "We assessed verbal/auditory and visual/spatial abilities because each of us learns through a combination of verbal and nonverbal abilities. We also examined learning and memory to determine whether subjects were having difficulty with initial learning, remembering information for a short time, or after a long period of time."

"During the first trimester," said Willford, "45 percent of the women drank, on average, less than one drink per day." Despite these relatively low levels of alcohol consumption, researchers found an association with subtle difficulties with learning and memory in the offspring at 14 years of age, specifically in the auditory/verbal domain. "This indicates that drinking during the first trimester of pregnancy … has long-term effects on development. Many women do not realize they are pregnant and/or seek prenatal care during this critical time," said Willford.

"These types of deficits have already been demonstrated in studies with much higher levels of exposure," added Mattson, "and thus, these data extend the continuum of effect to include lower levels of exposure. Another important finding is that the effects of alcohol exposure on memory for verbal information were mediated by verbal learning, a finding that has also been documented following higher levels of exposure. This finding is relatively novel in the field and thus the replication in a lower exposed sample suggests that this effect is specific to alcohol exposure."

Yet another finding concerns growth deficits among those children exposed to light to moderate drinking during gestation. "These findings parallel earlier reports of continued growth deficits among those children exposed to light to moderate drinking during their mothers' pregnancy," said Willford. "This shows us that prenatal alcohol exposure can lead to deficits in multiple domains."

"There is no safe level of drinking during pregnancy and there is no safe time to drink during pregnancy," said Willford. "Women need this information before pregnancy recognition and their first visit to an obstetrician so that they may make better choices about drinking if they are planning to become, or think that they may be, pregnant."