Right who can tell Me what's going on

Light period, no pain no clots. Spotting mostly. I'm on Cd6. I have a 33 day cycle at most lowest 29.

I just finished spotting.

Took opks and although negative darker than expected.

I don't have pcos or any problems as just had fertility tests done.

Preg test 10u/ml negative.

Darker in person. Opks take 3hours apart not with fmu.