More kids but I dont want a man?

So I'm really considering wanting more kids but the part I've been unsure about is wanting a man. I just had my son 6 weeks ago. Dad is sorta involved but I'd rather him not he because, hes satanic, doesnt keep his language clean around our newborn, and complains about everything and stresses me out. He also hasn't made ANY sacrifices to make his life better for his son. So I'm currently loosing any kind of contact with him. Just cutting him off. We are not together and haven't been since we found out I was pregnant.

We weren't trying to get pregnant as I was told I had a very low chance of ending up pregnant because I have pcos but miracles do happen.

I'm 18 and I would like to have another baby in 2-3 years from now but I was thinking sperm donor maybe? I do a lot better without a man in my life as I'm pretty independent but I still love caring son.

Any advice?