I was with a practice that I hated, generally, and decided to switch. My first appointment with my new OB (who I love), I found out I had a MMC. He was so wonderful with it, and I was really glad I switched. With the first practice, they did a blood test, although there really was no reason for it as far as I could tell. Then when I got pregnant again with my new doctor, I called right away, thinking he'd also want to do a blood test, but he said, no all it will do is confirm what we already knew. Instead he just had me come in at 6 weeks instead of 8. So, I think you're good waiting. But, of course if it will make you feel better, then do what you need to do. GL!