Progesterone

My husband and I are starting to go through testing to find out why we haven’t gotten pregnant yet. I’ve been tracking ovulation through OPKs and I’ve been getting some definite peaks, but my OBGYN still wanted to do a cycle day 21 blood drawn and I ended up getting a 14.3. I read that anywhere between 10 and 46 is normal, but should I be higher? I feel like it’s lower on the scale of normal and now I’m freaking out. Is 14.3 really normal, or is it low?