20 and pregnant with twins

I’m 20 and this is my 3rd pregnancy. I had my first baby (girl) at 16 and my second (girl) at 19 and now I’m pregnant with twins (due in March). Being pregnant with twins is quite a lot different to my experience with my first 2. A lot more morning sickness this time, weird cravings and started showing a lot earlier than with my first 2. People still like to point out my age though saying I’m too young to have kids, which is very annoying, especially as I am engaged and have been with my fiancé for 5 years. We both have jobs and a house, so I feel like we are coping well with parenting.