High risk with twins/ limited ultrasounds

Ivy
I am 12w 4d with fraternal twins. This is my 4th pregnancy and I was high risk with orevious pregnancies due to pre eclampsia. I am already having high blood pressure and some other issues. I had an ultrasound on wednesday at 12 weeks and they didnt schedule me for another until 22 weeks. I am really upset about it.... is that normal?