Implantation Bleeding? Or Weird Period?

I Need A Little Help Here. Has Anyone Had Brown Discharge Mid Cycle? At First It Was Faint Pink, Now It's Pinkish Brown. I'm Having No Cramps Or Clots.  I Suffered A Ectopic pregnancy Last Year And I've Been Scared To Really Try Again. My Last Cycle Was Feb 15th-21st (I Know , I Have Long Periods And It Sucks!) And Now I Have This? My Periods Are 35-37 Days Apart So I'm Wondering Is It Old Blood From My Period? Implantation Bleeding? I Took A pregnancy test (Which Have All Been Negative) So I Don't Know Anymore. I Suffered A Ectopic And Was Told I May Have To Take Progesterone Too Help Me Carry Full Term. How Will I Know It Won't Be To Late For Me To Take The Pills For Me To Carry Full Term? ☹️