Relle, I have an anterior placenta with this bub, and although I started feeling movement at 14 weeks, it has been very irregular up until the last week or so. I find that when i am TRULY relaxed bub seems to know, cos he/she immediately starts kicking up a storm! But if I'm just 'trying' to slow down to feel movement, it doesn't always happen IYKWIM?

All the same, I would definitely call Dennis (just another chance to see him hey?!) and see what he thinks about you having your u/s earlier. It's worth it for your peace of mind