I keep reading (not scientific articles, just heresay from other people) that home dopplers and too many USs aren't safe. I have to get a vaginal US every 2-4 weeks to check cervical length and my next appointment for that is Jan 5th. I just scheduled a 15 minute gender US at a local US place here. I'm wondering.. is two USs in 6 days too much? Maybe I should reschedule my gender scan or just wait for my anatomy scan? Thoughts?