Cervix check

So I am pregnant with my second child but this is not my second pregnancy. When I was younger I got pregnant and had an abortion. I also had a miscarriage before. Both incidents resulted in me getting D&C. Today I had an ultrasound and everything was fine. They told me i had a very long cervix but they want me to come in every 2-3 weeks to check it. My first child was after the d&c’s and this wasn’t recommended for me before. Just wondering if anyone has heard of or also needs to get their cervix check frequently?