Feeling pregnant

First time posting but I wanted to get someone besides my boyfriends opinion on this. I had my period about two weeks ago and I just ended my ovulation time well for the pass couple of days I've just felt different,  I have this overwhelming feeling like I'm pregnant again. Am I crazy or could I actually be pregnant? I've heard stories of women who knew they were pregnant as soon as it happen but is that true? I know it would be way too early to take a test but I'm way to nervous about it.