Testing after IUI??

Ladies I had my first IUI December 21st of 2017 with my trigger shot the day before. This means today I am 13 days post IUI and 14 days past trigger shot.

I want to buy a first response today, will today be a good day to test? I didn’t test out trigger because I didn’t want to stress..Now I’m at my breaking point..I have the itch to test for pregnancy.

If I test today being 13dpiui with FRER then more than likely the results would be legit??