Men. How to understand them.

So we had unprotected sex the 28th last month, the first and last night. My period is supposed to come the 12. I'm not sure if I'm emotional and sensitive to my period or possible pregnancy. We are ttc. I have a child already but my body never really snapped back. I'm insecure of my baby pouch, my saggy boobs and my thighs. I completely changed. Today I caught my other half jacking off to some other woman on the internet that looks beautiful. I have to beg him for sex. I just feel super lost. I feel like I'm inadequate to his beautiful/sexy standards. I'm lost and idk if it's me overreacting or this is a serious subject