Hi op,
I agree with pp about insisting on more support. Make a nuisance of yourself and don't let them fob you off.
I can empathise with your situation
. I have a unicornuate uterus (just one half), which was discovered when we were referred for fertility treatment. Currently 23 weeks following IVF so understand your fears - some of the stats are terrifying. Pregnancy is worrying enough without all the extra risk factors isn't it?
Care wise I am consultant led and had fortnightly cervical length checks from 14-22 weeks as an incompetent cervix can be associated with my abnormality (not sure if it's the case for you too). From 26 weeks I'll be having 4 weekly growth scans as the big risk later in pregnancy is pre-term labour as the baby runs out of room in my half a womb (I assume this could be similar for you if the two halves are totally separate) so it is important to be monitored.
I had to push to get this level of care. Several phone calls and visits to midwife, explained the condition (very few medical professionals seem to have heard of it...I've had sonographers say "unicornuate? What's that then?"), and my associated anxiety etc until she got me a consultant appointment. When I got there they tried to fob me off with one of his registrars which I flatly refused and finally got to see the lead consultant. Since then things have been better and I always see the same consultant. Still anxious of course, but feel things are at least being taken seriously.
My advice would be to contact your midwife again. Make sure you have the facts to hand and explain why you feel it's important to be more closely monitored. But also play on the anxiety/ impact on psychological well being angle. If necessary cry...it makes people uncomfortable and they usually do what you want to shut you up/ get rid of the crazy emotional woman! But most importantly don't give up. You know you need more support and you should trust your instincts.
Sorry for the long post! Wishing you all the best with your pregnancy, I will be thinking of you.