Okay I'm 15 and had unprotected sex about 2 -2 1/2 months ago.
Since then I have been late for two of my periods but I did start them.
Its not like me to be late so when I was late the first time I got really worried.
But I started my period so I forgot about it.
Well when the next month came up I was late for that period to I was 1 1/2 weeks late.
My question is.. is it possible that I am pregnant and that's why I'm late?

If you are pregnant it wouldn't be likely that you would keep having periods, even if you were late. Just to be sure, because you had unprotected sex, take a home pregnancy test, just to be sure and clear your head.

Your period can be delayed by things such as stress and poor diet :)

I completely agree with Nautical ! She is right you need to find out , although it is rare some women do continue to have periods through out the pregnancy. If you are pregnant you need to get to the Dr. right away because this is not normal. If you are not pregnant it might just mean as you are developing into a woman your cycle is changing I used to get my period like clockwork, then sometimes because of stress at school or work when I was a teen I would be late... I was not worried about it because I was not having sex... And as I have had each child, my cycle has changed all over the place.
But I would still see a Dr just to make sure everything is really OK even if you are not pregnant. If you can't go to your regular Dr. go to a planned parenthood, and now the Mom in me... Sweet heart, you are 15 don't go throwing your life away for some guy who only wants one thing... think about it if you are pregnant then what?? Are you going to keep it ? Abortion ? Adoption ? Are you going to get married to the father? Get a job ? Buy a house ? Pay for daycare? I am not saying some people can't do it... I know quite a few people that when I was your age were pregnant... one of them my best friend, and yes she did turn out OK... but it was HARD and the baby's father took off and can't be found , so she did it with the help of her family and some "real" friends and you find out real quick who your real friends are... Ok I am sorry I will shut up now , it just makes me sad that a 15 year old girl would have to worry about being pregnant... I hope you find out soon! Good luck
Ange