Weird mini cramps after ovulation?

Rachel
This is my 2nd month off BC - 1st month trying . I have a 2 yr old and with my last pregnancy I had implantation bleeding but didn't realize it (cramps and little blood)
I ovulated 3/8, we BD 2 and 1 day before. AF is due 3/20. I've been having funny cramps on the side I ovulated on for the last couple days but no blood. Its way to early to test but I also have a hard time believing I'm pregnant - CM is watery but not a huge quantity... any feedback appreciated.