I want another baby!

I'm 21 yo married my husband is 23 we have a 2 yo son. i want another and he keeps trying to wait and push it further away. im starting to not like him or want to be near him. i even think about divorce because I feel like my life is always revolving around him. I used to have very irregular periods and I have an Incompetent cervix. once I hady son my periods have been super on time and predictable, im just afraid if we wait too long it will be hard to get pregnant and I dont want to risk that on top of IC. I want my kids to be close and in school together at least. I also dont wnat to start teaching again and have to take another 2 - 3 year break and be way behind in my field of work. Can anyone give me any advice or insight if you have been through this?