Tmi bleeding

Molly
Okay guys basically I was on depo injection for 2 years, came off 9 months ago to TTC and got regular periods 5 months ago. My last period was last week and the day I came off it my partner and I had sex. 2 days ago I had white discharge and when I wiped yesterday it was brown discharge and now today I'm bleeding. What could this mean and has this happened to anyone else?