YOU REALLY DONT HAVE NE CONTROL OVER UR HORMONES BECUZ OF THE FACT THAT U R PREGNANT SO UR MATE SHOULD UNDERSTAND WHENEVA U GET RATIONAL OR WAT NOT SEEIN HOW THEY KNO THE FACT THAT UR HORMONES R REALLY CRAZY RIGHT NOW
Explain to your SO that your hormones are out of whack, and hope he/she (u never know) will be understanding. It doesn't end right after birth, though. It will continue for a few weeks/months afterwards.
The thing is that you wont even know when your hormones are going crazy, I didnt think I was as nuts as I was when I was pregnant until several months after my second daughter was born and started thinking back.....just try to be open to hearing your SO when you are being hormonal. Eating right and excersising will also help keep you somewhat sane. LOL I only say that because I was hormonal to the extreme a few times.