Low Progestorone at 5 weeks & Unicornuate Uterus

I am 5 weeks pregnant, at just under 4 weeks I had hcg tests at 81 then 3 days later at 241, I have since had some brown spotting so I went into the hospital today and my hcg is 955 but my progestorone is 10 - they said this isnt a very strong positive test result. I am going back in 2 days for more bloods. Should I ask for progestorone supplements? They did an internal scan today too and it didnt show a sac. I also have a unicornuate uterus which I'm not sure may have an effect on my production of progestorone as it is produced by the ovaries and I only have one connected. All help and advice would be really appreciated! Going stir crazy x