i fit was the day after your period your chances of getting pregnant are low and if he only put the head in your chances of getting pregnant are also low. It doesn't sound like you would be pregnant. If your period is late next time, take a test. Dont stress yourself out over this though because the added stress could make your period late and worry you even more

I wouldn't worry about it. It was the day after you period so usually you are not ovulating or anything. There was penetration though so I would consider that sex. But i would say you have nothing to worry about.

You definitely had the beginning of sex, because penis vagina = sex normally. However, it's unlikely you're pregnant.

NEVER let a penis near or in your vagina without a condom on!!

Since you are sexually active, it would be a very smart idea to get on some birth control.