Confused! What are these symptoms?!

Bailey • TTC for baby #1 for a year and a half. One ovary. Praying for my blessing!
So I'm only a few dpo but for some reason I have stomach tightening feeling below my belly button area right in the center, it doesn't feel like a stomach ache or anything but it's a feeling I haven't had before and I have been trying for 8 months. I have gone through all of the in-my-head symptoms with previous months but this month I'm not even thinking about it and I have these symptoms. I'm also feeling kind of nauseous (which I know is a later symptom of pregnancy). I just don't feel like myself! Could it be? Or am I crazy? Lol