Ectopic pregnancy?

I am about 4w&4d and i been testing faint positives for a week now , & that HAVEN’t gotten darker at all. & i been having pains in my abdomen and back, it feels almost like when you exercise and have an aching body the next day , or when you drink water and go running immediately after and have those cramps.

I’m scared this would be my rainbow, i miscarried in February and don’t want to lose this baby either 😢😢 i have an appointment Monday morning to confirm my pregnancy through blood work n that’s it ):