Worry

After 2 years of TTC finally got a BFP after a conversion cycle from IVF to IUI. A miracle that it seems to have worked! My last pregnancy ended up being a blighted ovum, so I can't stop thinking, obsessing over my HCG levels. Had 2 blood tests so far and my numbers looked good- slightly over double in 48 hours. Next blood test is Monday, then ultrasound the week after. I'm trying to be ruthlessly positive, but I'm obsessing. Any advice?