Just found another link from the site mentioned above with good info Check out
http://www.additudemag.com/adhd/article/3991.html
"In conclusion, there are not enough data on use of stimulant medications in pregnancy to allow definitive conclusions about their reproductive safety. Available data for Amphetamines suggest no increase in the risk of malformation when used at therapeutic doses, while infants might have slightly lower birth weights. Human data on Methylphenidate is limited and we cannot rule out the risk of malformation given the available information. Alternative pharmacologic treatment options include tricyclic antidepressants, bupropion and clonidine; these drugs have more evidence to support their safety in pregnancy." from - http://www.womensmentalhealth.org/posts/clinical-update-use-of-stimulant-medications-in-pregnancy/
Also check out this site. There are a lot of posts by women who are going through or have gone through what you are. Some good personal information here. http://www.additudemag.com/adhd/article/910.html
Finally, don't worry about drifting off while people are talking. Its what people with ADHD do. If these are friends, they will understand and just redirect you back. And its also possible that they don't know you have ADHD at which time you have an excellent opportunity to educate them on ADHD and how it effects people.
Best wishes and Happy Holidays!!