Confused....

OOk so i had a csection 4 months ago..ive been having brown tissue..light and dark blood since then..... i had sex for the 1st time last week with a condom...i was on top and condom slipped off in me..i got right off and pulled it out he had not came yet...is it possibility i can get pg...im still having brown tissue discharge sometimes red...plz helpi do not want to be pregnant...also i was on the depo and i missed my shit right before this incident