Idk what’s going on with my body?

Hello I’m new here! I downloaded this app because I need girl to girl talk because idk what’s going on with me. A little back story about my self is that I just had my first baby back in August 2019. My period ofcourse was off the first few months but after November, I was getting in every 2nd-3rd. At the end of January I started to have this brown discharge and I’ve never experienced this before. I looked it up and said it could happen before I started my period, which I thought was the case cause I thought it was coming on the 2nd of February. I had the brown discharge for about a week and my period never came. Ever since I had my baby I haven’t really had sex like that because of the fear of being pregnant again! (I’m 19) . & we’ve only used condoms, the very little times we’ve had it so I don’t think I could be pregnant . I’m confused ! I need advice 😕