What’s happening?

Hi everyone I’m new at TTC this is our second month, we did the deed everyday I was ovulating and AF is supposed to make her appearance in 3 days but I’ve been feeling really weird lately. My stomach has been feeling like things are moving around ( not a human or anything) but it’s not like sick feeling or vomiting, my nipples have been hurting SUPER bad and they never do that before or during my period, and I’ve been having heartburn pretty bad which I have never had in my life my husband had to tell me what it was. I took a first response test this morning and as I can tell it’s negative... any thoughts??? ( ps ignore my dirty counter 😂)