So excited but scared! hCG 118, Prog only 19

We've been trying for over 4 years, and every month the emotions are crazy! After a year of trying, we went to see a specialist, found out that he has very few very slow sperm, and one of my tubes was blocked, triple whammy :( so i had a tubal cannulation, unblocked beautifully, but still another year and a half passed with no luck...so we tried IUI 7 times, lots of opk's later and $700/attempt later, we decided to try a cycle with donor sperm, and still that didn't work, so at this point I was almost ready to give up, and we were almost out of money :( we tried one more cycle with donor sperm and Clomid, and on day 28 (3 days ago) i took an hpt just to see and got a BFP!! I couldn't believe it, i started crying my husband just stood there holding me while i completely freaked out! I took a second test this morning and still BFP! Got a blood test today, and confirmed! However, my hCG is 118, and my progesterone is only 19, and she said they like to see it at 20, so she gave me Prometrium suppositories, and I have to go back in for another hCG and Progesterone test...I'm scared now that it won't stick after all this time and all the emotions, has anyone else had a similar experience that worked out to have a baby??