Truly pregnant or still getting AF?

Laura

last saturday I woke up and wa sure,this was it! and I got a BFP Saturday and Sunday, on all the brands I used cause you can never be too sure right?

but today I am feeling like I'm about to get my period. My back is its usually angry mess and I got quite a bit of pressure and light cramping in my lower belly going on. Is this normal at 4 weeks or is my current anxiety attack justified? help?