Scared about symptoms

AF due 4/10. Took test on 4/4 and got a faint positive but it was a blue dye test. Bought first response test and got another faint positive today 4/5. I'm just really scared because I've been having cramping on and off with some back pain. I'm tired and I feel like my boobs got bigger but I don't know for sure. Sometimes I feel like I'm burping stuff up like I might puke but nothing serious. I'm just worried because I've had an ectopic pregnancy and I just had a chemical pregnancy 2 months ago. We have an almost 2-year old. I'm going to the dr on Monday for a blood test if I don't start bleeding before then.