Did any of you just "know"

My DH and I have been TTC for 3 months now. Its really taken a toll on me emotionally. I stressed myself out so bad last month I barely had a period. Ever since ovulation I've been extra happy and calm. I'm 8 DPO had some weird period cramps but only in my left side. I've never felt anything like that before. I've been told you just "know". I really feel like I could be but don't wanna get my hopes up! my amazon order of pregnancy test are screaming at me to take them! Haha! anyone else been pregnant and just "knew"????