I'm not sure what's "normal" for IVF, but as this is my second pg I've been a little naughty at going to the doc. So I didn't go much in the fist tri, but I had looked up all the things I needed to do & knew by what date I needed what, like scans, glucose test, my injections etc. In my second tri it's every 4wks up until 28wks, then every 2wks until 34wks (I think) & each week after that. This is through my hosp.
Though I would just check about your scans as there is one between 18 & 20wks, I presume you will need to make an apt...has your doc spoken to you about that? As you will be up to 20wks by next appt.