Highly confused!!

Ivana

Please show me your bbt charts when you were pregnant...if you had implantation bleeding how did it look and how long did it last? Let me explain: this is my bbt chart, I started spotting on Thursday after negative HPT (8 DPO), still spotting but it’s almost non detectable (I don’t need a pad and my underwear stays clean it’s only after I pee and wipe that it’s seen), color is brown, no sign of red blood or even pink, cervix still feels very high and closed, positive opk today (don’t ask why I tested with it 😂), since Thursday very very nauseous and dizzy, fatigue, no cramps just this weird feeling like my uterus is swollen and sensitive, lower back pain (but I’m a nurse and have damaged lower back so not really relevant I think), heartburn, slight constipation...usually my spotting before period gets a bit more every day but this time it’s like it’s getting less by every day...my period usually comes between 10DPO (which would be today) and 12DPO...With my son I bled for 10 days before I got positive at 5 weeks 5 days...I have early detection test (as low as 10 mlU/mL) that says 4 days before missed period, should I use it tomorrow morning with FMU or would it be too early?