Very Concerned !!!!

Okay ladies I haven't had a period since March 18, 2015. So in April I took a home pregnancy test and it came back negative which made me believe my period is just irregular again. So lately for the past 3wks I've been feeling something which I believe to be small flutters and even. One day I was having an conversation and something in my stomach began to get tight twice. What should I do I've been trying for so long I don't want to get my hopes up over nothing????? Please help me!!!!