Bleeding

I’m new to writing on posts like this. Here goes. Me and my partner have been together for ten years we have two girls already. Since our youngest 3yrs old we have been using the pull out method although wen I was close to my period this time we didn’t pull out . Just last couple of weeks I felt pregnant ie itchy Boobies heart burn etc I ended up being 16 days late. I had a bleed which was mainly dark red and brown fairly light really bad cramps lasted 3 days at the most. 5 days after coming off wot I thought was my period now I’m having bad cramps again and a bit of brown discharge wen I have a wee and wipe. What is wrong with me 😂 surly I’m not pregnant I never bled in my other 2 pregnancy’s but Iv never been this late or had this before.