Implantation bleeding!??

Jessica

I am currently seeing a fertility doctor this cycle I did timed intercourse with a trigger shot. After ovulation I was put on progesterone. On cycle day 27 and 28 I was getting cramping and light brown discharge. Mixed with the progesterone discharge. I tested on day 28 negative and got a bfn. I am going to get blood work to check pregnancy. Progesterone usually keeps the period from beginning so I’m not sure what the brownish discharge was?

Thoughts!???