6 months PP and pregnant again??

I wanted to post this anonymously because I have family on this app, and I don’t want them to know anything. I’m 6 months postpartum and I thought I had gotten my periods back I had two and they were mostly old blood but I haven’t had one in about 2 months which is how far along I was when I found out about my first baby. Lately I’ve just had this weird feeling in my stomach. I thought I was going to start getting my period back again since I was cramping and had typical period signs that I used to have but nothing has happened. I am on the pill btw but I know it’s not 100% effective. I guess I want some advice or to know if anyone thinks I’m pregnant again.