NEED HELPPPPP

So. Haven’t had my period in a couple months since my bc shot was given to me in June and ended in September. Had sex ab a week ago and he finished in me. For the past two days I’ve had cramping, nothing serious. I also had some brown spotting. Wondering if it would be implantation?

First day (17)

Second day (18)

And today it has slowed down and has looked like that ^ anything helps