Need some reassurance...(TMI)

I know this is going to sound insane as I am only 3dpo, but I am so anxious to know. I don't feel like I'm pregnant right now (I had some intense stomach cramps this afternoon, got excited thinking it was something, and ended up having diarrhea later and felt 100% fine after that) I'm hoping someone can give me some hope (or honestly just tell me something in either direction). We're ttc #1 and decided to keep it to ourselves as to not have our family and friends on this roller coaster right away with us. So I feel like I have no one to talk to or seek advice from. #sosososos