Trying this again bec no response 😔

I have been ttc for 5 months now and had these irregular pulsating sharp pains on the right side of my uterus. Would come and go but It lasted hours and then went away. 
Any idea what it was?? An app says based on when I have my. I should have ovulated around April 30.. Figured it was too early for implantation cramps. 
Any other ideas??