IUI maybe ovulated to early

clomid days 3-7 started testing day 10 for ovulation, I went today which is day 12 for follicular monitoring. Doctor thinks I've ovulated already he took a blood test, said it looks like I've ovulated but wants me to come Monday for another blood test to be sure cause the one today wasn't 100%. So might not be havin my IUI until next month, Anyone else have this happen to them.