I have been on the pill for 2 and half weeks and I had unprotected sex last night... should I be worried?

uh, sex= possible pregnancy. Unprotected sex= greater chance of pregnancy. If you don't want a baby right now, yes, you should be worried. Since that's how babies are made.

You could try taking the morning after pill. Don't wait a week to go find out about it. It's only an options for something like the first 72 hours after sex (you'll have to verify the time frame, I may be off on it a little) and the longer you wait, the less chance of it being effective.

I have been on the pill for 2 and half weeks and I had unprotected sex last night...should I be worried?

Since you are on the pill you shouldn't be as worried as if you had unprotected sex, but remember, the pill is not always 100% effective.

I'm sorry, I totally misread that. I thought you said you've been OFF the pill for two weeks. My apologies.

I would also like to remind you that there are other things you should not forget to be concerned about when having unprotected sex, STD's.

The pill will not protect you from them and a man could easily lie or not even be aware that he is carrying one.

I would suggest going to a doctor even if you aren't pregnant and having both you and your partner tested just to be safe.