Weirdest thing ever.. Wtf is going on??

Emily
So two days ago I was laying in bed and started feeling a spasm in the right side of my uterus. It was the weirdest thing I've ever felt. It went in for a min or two and stopped. Then the next night I was sitting in a chair and felt it again! Same exact place. Last night hubby and I were having intercourse and right as he was about to... You know... I got an intense cramp in the same spot the spasms were. It was a painful cramp (made me cuss a little). It felt better a few second after he got outta there but good lord almighty, I've NEVER felt that before. What could this be?? Of course my first thought is I'm pregnant, we did try very hard this month so it wouldn't come as a surprise but can that cause that??? Thanks!!