Please help me? Chemical Pregnancy?

Rach.

This is now my 6th BFP this week and today is the day my P is supposed to start. I got a BFP this morning and this afternoon after drinking a lot of water.

However, I feel period-y. Lower back pain, cramp age, upset belly, I also have brown blood and red blood that’s minimal but more than spotting. What is going on? Is this a chemical pregnancy?? Please help