Cramping and tender beasts after iui

Alicia
I had an <a href="https://glowing.com/glow-fertility-program">iui</a> done may 20th. My boobs started getting sore and I started getting cramps just a few days after. The last time I was on clomid and we tried naturally i had those symptoms a week after taking the trigger shot. And then started my period( after I took a neg. pregnancy test). Why would they start a few days after?