L.L.
I would just say since you are not sure about a lot of things right now, including your relationship and the timing for another baby, that maybe you should consider family-planning and use some type of birth control. I see in your "a little about me" you stress that you need to take better care of your kids financially, that could be a big issue too.
You do want stability and security in your children's lives, so maybe think about establishing yourself first, educationally, spiritually, financially, emotionally, etc. as a whole person first. TAke care of you and the precious ones you already have. No need to bring another child in the world right now which may cause you to struggle more, being that you do not have the stability you need in a loving, committed and trustworthy relationship to help support you and strengthen you as a mother anyway.
Single parenting is an enormous task, and based on my personal experience, having more children out of wedlock in the midst of it made things extremely worse. I encourage you to first set things in order in your life and maybe get on some type of birth control so you won't have to focus so much on being pregnant and focus more on reaching your goals and taking care of your precious little ones. I hope I am not being too blunt. I really feel you. Been there, done that. Learned great lessons and trying to share them with you.I am speaking to you in L. R.. I pray that God gives you more wisdom, which we all so need, to make the best decisions for your life.