ovulation kits questions

my husband and I have been TTC for a year-and-a-half and I finally went to a fertility doctor on December 7th and she told me to start doing ovulation kits, which I have never done... my cycle is anywhere from 30 days to 33 days. I'm on cycle day 23 right now and I haven't done any ovulation test because we thought my husband was going to have surgery for his varicocele veins. would it be too late to start now should I just wait until next month to start the ovulation kits? with the ovulation kits if you guys have any tips I would love to hear them!😁 FYI my husband did a sperm analyst test and everything came back fine. so the varicocele veins are affecting our fertility.