young parents

I am 4.5 months pregnant with my first, I am 20 years old and my boyfriend is 19. We have been together for a little over a year. We rent our own 2 bedroom place and have 3 doggies. Typically, we get along quite well but we do butt heads some days. I get really doubtful and emotional when this happens (party because of my hormones). Right now we are doing good but I want to keep our relationship afloat being young parents. I know it's only going to get harder with a baby in the picture but we both want this more than anything. Any advice on how to keep a relationship going and strong as young parents?