From personal experience they don't usually scan you. It's basically just like another midwife appointment how ever it's just about the certain risk factors you have. They will discuss with you about your pcos Etc and then do the normal check urine, bp etc talk about any concerns you have. M
For example this pregnancy I've been told I'm underweight so have been told I need more growth scans, also been put on aspirin for possible pre eclampsia because of family history and also been told to come in asap in labour for antibiotis due to gbs. (All of these issues were discussed and resolved at this appointment) mine was fairly long this time. But my first pregnancy I was in and out with in 5 mins and discharged from the consultant. They decide whether you will be cared for by both midwife and consultant or just midwife xx