Scared im pregnet but i havent had ? whats wrong with me:(?

So im 16 and just starting to get slightly ualy active. I havent had but i have done stuff with my boyfriend right now. But for some reason i get scared i'm pregnet all the time! His "thing" hasnt been close to my "area" what so ever and yet im due for my period any day and its taking forever so im well...nervous. i really dont know why. and even my boyfriends wondering why im acting so odd:/ help:(