Yay for a growing baby! So glad you all are doing well
As for BC, I think you got great advice here and your doctor will be able to discuss options too. I went with the IUD and have loved it, as soon as they remove it, you are safe to TTC right away, which was great for me! This is the 2nd time I have had it btw. I have Mirena, but there are others out there like Paragard that don't have hormones in them. However, the IUD is not for everyone, so discuss it with your doctor and find out what he/she thinks or recommends for you.
As for DTD, take it slow, the first time isn't necessarily fun and if you need to stop, by all means, stop. I had to the first time after my Reagan was born, this time we took it a lot slower and that was much better. Just talk to DH and explain to him that the first time may not be so great for you and that you may have to stop/take it really slow/etc.