18 years old young mother. Need help,

I am 18-nearly 19, i have a 2 year old son (Birth control pills failed)  and 29+ weeks pregnant, (got pregnant on the implanon) It's happened and I'm pregnant for a reason, and if I am
But now  I am  recently single due to my ex partner not wanting a family, but I have refused his support money (he will still have access to our kids anytime he wants) but he doesn't want that option. Anyways just seeing any advice yous could give me. I haven't been out of a relationship since I was 13.. Me and my ex partner dated in 9th grade... I know I won't be financially unstable. As I have much savings and a steady income, I just don't know what it would be like being alone and kids whose father wants nothing to do with them or me...