can someone help me😭

I'm 48 days late on period!! Iv taken 2 at home pregnancy test, both neg. Went to a clinic that one was negative, but I still havnt started?! The most iv ever been late was going on 2 weeks so my periods are pretty regular for the most part. I'm freaking out I don't know what to do. I don't have any symptoms except my boobs are sore as heck! And when I lay on my side, I feel like a flutter or something like that it's hard to explain the feeling. Has this ever happened to anyone?!?