Low progesterone

So I had my IUI done on 7/1, and today the doctor’s office called me and told me my progesterone level was a 6.82. I’m pretty bummed because I feel like our first IUi didn’t work. I asked about being prescribed something for it, and she said if my HCG test comes back positive on 7/13 then they will prescribe me something then. I would think that they would do something about it now, but I guess I was wrong. Anyone ever have low levels like that and went on to conceive?