22 and trying for our 3rd!! Opinions?

So I got prego with my 1st at age 19, and my second at 20-21. They're a year and a half apart exactly and I'm in love!! I never wanted kids until my husband came along! I know it seems early but my second is almost a year and we decided to try for our third and maybe last baby. The more I thought about it I don't want to wait because I don't want my two to grow up and get in school and then we have to start all over again be cause we want more. So honestly I'm ok with having another right now but at the same time I'm nervous about the labor ( WHO ISNT! Lol) even though my first two weren't that bad! What do you guys think!?