AF & pregnancy symptoms 🤔

So, I've been having some pains in my stomach here lately and it's driving me crazy. AF is due on the 4th.  Very nauseated to some foods. I love chocolate but last night SO was eating a chocolate brownie, my favorite btw and I couldn't stand the smell of it. And after he was done eating I could still smell it. 🙄. The back pain is excruciating some nights.  Idk if it's AF symptoms or pregnancy symptoms. Can you ladies tell me some of your stories? 😌.  Also ladies, did any of you get implantation bleeding? Cause I know some people don't experience the IB and end up being pregnant.Â