Need advice

Okay, so I am 16 years old and I think I'm pregnant. In March, my boyfriend and I lost the baby. I am 25 days late for my period and I've been experiencing symptoms that I had with my previous pregnancy and some new ones. 
I don't know how to tell my mom or dad that I'm pregnant again and I want to advocate that I'm going to keep her/him whether they like it or not (they kind of forced an abortion on me and it was really hard).
Any advice for me from any moms that know how I can tell them. 
My stomach is normally perfectly flat but my stomach has gotten rounder and more out. 
This is my stomach now.
Here is my stomach before