Worried now

Hello. I am 18 and have always been attracted to older guys. I have been with this guy for 2 years now. And he is 16 years older then me.

I just gave him my virginity 3 months ago. I have a promise ring. Now I found that I am pregnant and I am worried. He does have 2 children close to my age. 14 and 15. He is divorced. I am afraid because I know being a mom is a very big responsibility.