There is no known safe amount of alcohol use during pregnancy. There is also no safe time during pregnancy to drink. All types of alcohol are equally harmful, including all wines and beer."
https://www.webmd.com/baby/news/20190828/even-a-little-drinking-while-pregnant-ups-miscarriage-odds-study
TUESDAY, Aug. 27, 2019 (HealthDay News) -- Just small amounts of alcohol during pregnancy can increase the risk of miscarriage, researchers warn.
They analyzed 24 studies conducted between 1970 and 2019 that included more than 231,000 pregnant women.
They found that drinking alcohol during pregnancy -- even small amounts -- increases odds of miscarriage by 19%. Among women who have fewer than five drinks a week, each additional drink a week during pregnancy was linked with a 6% higher risk of miscarriage.
"Since alcohol is one of the most common exposures in early pregnancy, it's critical to understand how consumption relates to miscarriage," said lead investigator Alex Sundermann, a doctoral student at Vanderbilt University School of Medicine in Nashville, Tenn.
"Adverse pregnancy outcomes, like fetal alcohol syndrome, are often associated in popular culture with heavy consumption. However, our meta-analysis indicates even a modest amount of alcohol use has a meaningful impact on miscarriage risk," she said in a university news release.