I'm Pregnant?HELP ASAP!?

Hi, Im erin and I think im preggo im 14 and sexually active my belly is starting to pooch out at the bottom and im feeling little flutters. I'm trying to hide it but im moody and i feel sick alot....only prob is ive been having a regular period but its been short-significantly! like two day periods! but its been light too! Im scared but its the same time everytime! soo wtf? please hep!! my mom has been saying im actting weird, but I dont wanna tell her and I cant go get pregnancy test! I have to be 13-15 weeks help!! no pain just little flutters at random times everyday! ZOMG HELP!!!!my boobs getting bigger all the way to a C-cup and their tender! please!