You will have to wait until your next period is due if you dont start then you should take a preg test. What in the world are you doing having sex at that age anyways. You need to go get on birth control or something. Try to find a plan parent hood around your area they are confidential or a clinic around by law they are not allowed to tell anyone not even your parents. But I recommend you dont do it at all your to young and have to much future in front of you.I hope this scares you so you wont do it anymore.

Dear 14 year old I was seventeen when I got pregnet I am now thirty with two girls and a wonderful husband but the road was hard and I am not with my oldest daughters father he just couldnt deal with anything grown up. You need to talk to an adult some one that you can trust. First find out if you are really pregnet. Their are free clinics that give free pg test.
God loves you !!
Pray he will help you