Getting discouraged

Bri

Had my first IUI on June 21st also taking letrozole and metformin (have been taking them for a long time now) but I’m just getting discouraged, supposed to start on Friday in 3 days and I feel like I almost have period cramps. I’m just upset because I really want it to work this time. I know the odds, I know the chances etc. im just upset but i know I’m not out until I start. Had anyone else got a positive but felt period like cramps?