How Freguently Do You Get Ultrasounds?

Da

I am 14 weeks 2 days today and I was suppose to have an ultrasound but my doctor was out today and I was told I do not get another ultrasound until 20 weeks. I havent had an ultrasound since 10 weeks and I was originally told they would be every 2 weeks due to being high risk in the beginning. So I'm just curious how often other women get ultrasounds cause I'm quiet irritated by the fact I wont see my son for 6 more weeks.