Missed/late period

I had my first baby in April and I had my first period the beginning of July but these past weeks I’ve had brown/pink discharge so I keep thinking it’s going to start but it doesn’t.

I took some tests and they were negative. I’m not having any symptoms except for heartburn and my lower tummy feeling bubbly(that’s how I was during my pregnancy)

I also took birth control during that first week in July and immediately stopped taking it because I started doing my research on it and it’s not good but when I stopped taking it I had another period Immediately after my first one so my period lasted for two weeks pretty much.

I definitely want more but not right now my fiancé and I were together for three years and never had a pregnancy scare. I also read it takes a long time to conceive my friend, it took them six years and they have one then they had a ectopic and now she’s having a rainbow 🌈

I mean is this normal?? I’m stressing out, I can’t sleep