Pregnant 13 weeks low progesterone

I just hit 13 weeks and was on progesterone from week 5-12. They told me to stop at week at, and I stayed on it until week 12. They refused to retest my levels, so I went to a local lab where it proved my levels are low for hitting the 2nd trimester. Even the doctor confirmed it was low. It’s suppose to be 24+ and mine are 18, but they won’t supplement until it’s below 15. Has anyone else with pcos had low levels and had a successful pregnancy? I’m getting a 2nd opinion Friday, but I’ve been cramping for the past 2 days pretty consistently. I also miscarried over the summer at 8 weeks, but I remember spotting first.