I came on my period 12/28/2010 and went off 12/31/2010. I had sex with a friend on 1/1/2011 and then with my boyfriend on 1/16/2011 and 1/24/2011. I haven't came on my period yet;so could I b pregnant and if so when did it happen.

Okay, well first of all did you know that sperm lives inside your body for 3 days?

Also, can you tell when you are ovulating between periods (that is where you egg drops)?

I would say that is VERY possible you are pregnant!

I would go to the doctor ASAP.

You got a HUGE issue now... you don't know who the father is. This is why you shouldn't be sleeping with more than one guy at a time.
Because those two guys will look like the man... and you will become the town slut. I don't think you want that rep.

So you are going to have to make a choice here... either terminate w/ the abortion pill (you still have time).. and pray it works (it works better the sooner you take it) OR try to have the doctor guess when you may have become pregnant to see if you can figure out the father.

I am guessing it your boyfriends... but you don't want to make a man responsible for a baby that may not be his.

On a side note (and I say this with love): If you were my daughter I would tell you to have an abortion and stop sleeping around like you think are worth 2 cents. Not to mention you will end up with HIV and then you are done.
Its not cool and is very loose. You should be focusing on growing up and getting your life together, so you can have a nice one. :)
And if you want to be w/ another guy... just break up w/ your boyfriend. Its not nice to treat people in a way you don't want to be treated.

I hope this helps. :) I wish you the best of luck!

How long are your cycles normally, from the first day of a period until the day before the next one starts?

If you ovulate on the early side, it would be more likely to be the friend's. If you ovulate on the later side, it would be more likely to be your boyfriend's.

Unfortunately, if you are pregnant and that would be the first thing to determine, you will need to have a DNA test done after baby is born to know for sure.

If it turns out you are not pregnant, be smart about your decisions so you don't have to deal with a scare in the future.