Please help me ladies!

Lara

According to my chart I ovulated mate this month. I took a pregnancy test on Saturday which WAS positive. I actually took 3 and 1 on Sunday very faint lines but positive. I waited a few days and tested again Tuesday and got a negative. Also had a blood test which is negative as come back as levels 5! My chart is still high I have no sign of AF my boobs and back kill me I’m exhausted. Please help have I Hd a chemical pregnancy if I’ve miscarried then why am I not bleeding?

I don’t think FF have my dates right for ovulation because I normally ovulate on cd15 which means I’m actually 5 days late??