I’ve been doing pregnancy test and they’re all coming back faint but getting darker over the days.

I’m 4 days late for my period but this morning I noticed loads and loads of watery light pink discharge. Put a pad on and nothing but light pink but such little amount. No blood when I wee like a normal period just light pink when I’m wiping.

Could I be having a chemical pregnancy. I’ll be around 4 weeks 5 days. So upsetting as had a miscarriage 2 months ago :(