Implantation or period?

Husband and I have been trying to get pregnant. I hadn’t had a period in 73 days and kept getting neg tests. My periods have never been irregular before.

Well aunt flow finally came yesterday.. but it’s very brown (brown discharge) and not really flowing and now has stopped on day 2

Could this mean i could be pregnant and it’s implantion bleeding?

Or is it normal to be brown at the beginning since my period was so late.

I also just started tracking ovulation late last month into this one and my peak was on Dec 2nd. Soo think that’s when I finally ovulated. It was a positive ovulation test.

What do you all think ?!

Thanks everyone for the help