I've been on both sides of how this can turn out. There's really nothing that a single HCG level can tell you other than if you are pregnant or not. It's the second blood draw that will tell you if the pregnancy is progressing normally or if it could be in jeopardy. The level should at least double every 2 or 3 days. So your level should be at least 60 when they draw on Friday. Those are the facts I know from experience, but here's the short version of my experience:
Pregnancy 1: Diagnosed as pregnant at my doctors with a pee test. Didn't do a blood draw at all. Found a new doctor when I started bleeding a month later. Hcg levels continued to rise over the next month (while I was still bleeding lightly), but they weren't increasing at the rate they should have been. Levels stayed within the normal range, just always on the very low end. Ultrasound confirmed that the pregnancy wasn't viable but that my body was not miscarrying completely. Had to have a shot of a chemo drug to assist my body with the miscarriage, but was able to avoid a D&C.
Pregnancy 2: Pregnancy confirmed with pee and hcg tests after some very light implantation bleeding. Both positive. Hcg taken again 2 days later, and had more than doubled. Beautiful 22 month old daughter to show for it!
Pregnancy 3: Had mid-cycle bleeding so took a home test "just to check" before seeing my doctor later that day. Home test was positive, hcg was 400+ and pregnancy dated to be 6 weeks even though I'd had a normal period 2 weeks prior. Hcg 2 days later was 3. Pregnancy miscarried.
Pregnancy 4: Didn't bother with a home test, just went to the doctor for hcg test since I'd had a tiny bit of spotting 2 days prior. Level was 18. Doctor was not optimistic because the level was so low, but I knew that the blood was being drawn on the day I was scheduled to start my period so I wasn't worried. I forget the numbers for the next blood draw, but they had approximately tripled in the time they needed to double. I started taking Prometrium to help my uterine lining be a healthy environment for a fetus and am now about 24 weeks pregnant with a healthy developing baby.
Good luck with the pregnancy, and please e-mail me if I can be any more help, support, or encouragement!