Random pelvic cramps days after ttc during ovation

My boyfriend/fiancee decided on May 15 to try to conceive. So we did that and when I came on Glow to mark it on the calendar I realize that that was my highest chance getting pregnant. On the 19th, 20th, and 21st I've been having these strange cramps. I have no idea if it's from (maybe if I'm lucky) the start of being pregnant or if my body is just acting up. They feel kind of intense to be in that region. I've had to take 3 naps on average everday for the past 4 days just to make it to 8pm. Possibly period cramps? Ummm.... No. I have NEVER had period cramps before and I've been getting my period since I was 9 (I'm 18 now). Also I know I haven't been moving around odd ways to cause this. I could just be walking and it starts. Every now and then throughout the day it would start if I'm leaning over or if I stretched.

Anyone felt like this or something similar days after ttc? If so, did you find out that you were pregnant? Are these pains going to go away soon? What's going on?!?!?!?