After I had my mirena inserted I went for a sonogram and it was not placed correctly. I had to go back and they took that one out and replaced it with a new one. It was way more painful the second time, I think because my cervix was still sore from the first time. I waited 2 weeks before dtd, I think, but I have a really sensitive cervix, so some women probably wouldn't need to wait that long.
So, imho, yes it's very important to go for the sonogram. Good luck.
Malinda, partner to Ryan, Mama to Super-Holden (Nov 2006) and my new little bundle, Declan (Feb 2010)