Can I get pregnant before my hcg is at 0?

Hi ladies. I had a miscarriage a few weeks ago and assumed my HCG was at 0 and was feeling normal finally- bleeding was over even tho no Aunt Flo yet... It had been months since hubby and I had sex and we had sex the other day. I got my levels checked and found out the hcg is 25 the day after we did it. Is it possible to get pregnant at that #? We are gonna wait til we know for sure that it is 0. What did your doctors recommend with this? With all of the emotions we have gone thru- and I'm finally feeling good physically...being able to have sex with each other would really be good for us. Lack of it really sucks but I don't want to get an infection or have another miscarriage either.