should I do a second US?

Ka

Planning to do my first IUI this cycle. Took 10mg letrozole days 3-7. Today I had a mid cycle scan (CD10) and had 2 mature follicles - 12 & 13 mm. Likely going to take more Letrozole and trigger shot next week. My coordinator said I could do a second ultrasound to make sure they grew on Tuesday or we could just guess & trigger Tues, IUI Wed. Any suggestions? Do it or skip it? Insurance doesn’t cover it so it’s $200 each time.