Ideally ... nothing. However your Dr may prescribe you medications that you may need during your pregnancy. Do NOT take ANY medications without talking to your Dr first. This includes over the counter medications as well as prescription ones.
drugs,smoking,drink too much
Some of the main things a woman should avoid while pregnant are smoking and drinking. Along with these is to be sure and not do any types of drugs.
The use of drugs and alcohol are very harmful to the growing fetus because it can abort, some don't have complete limbs, small heads , S.G.A. and I.U.GR.
In laboratory animal studies, some antimalarial drugs cause birth defects.
If he was on drugs and you were two states away - you may assume he slept with some one. The drugs (or alcohol) alters a person's ability to control themselves and changes their inhibititions
It can affect your chances of getting pregnant, some drugs have a link with a mans fertility
sex styles while pregnant
No it is not normal to have your period while pregnant. I have heard of some small spotting while pregnant but if you have your full period while you think you are pregnant, you thought wrong. You would not be pregnant.
Some women have bleeding while pregnant that they think is their period, but bleeding while pregnant is NOT normal and should be evaluated by an OBYN!
LOL - well, quite possibly. If one's mind is altered (drugs) then yeah a pregnancy can occur.
Some drugs or antibiotics can interfere with the way birth control pills work.
Because if their mother's have the drug when they are pregnant, the baby could receive some of the harmful drug.