Early pregnancy sign?

I'm the first one to roll my eyes at women knowing in the first few weeks they're pregnant.
Unprotected sex two weeks ago and a lot of it during my ovulation window. Now, I'm in my early 20's so very much a high chance of pregnancy. 
I have been a complete demon to my partner for no apparently reason. I'm an extremely guilt free, class A bitch at the minute. I'm fuming at any human contact, biting his head off for no apparent reason, bitching constantly and I'm not the least bit guilty of it. It's like I snap and say something hurtful before even taking the time to process what I'm saying.
Now that is not me. I have never had bad PMS or been one to ever be mean to someone.
Help 😂