it would be great if anyone has some tips for how to deal with them? (apart from not talking to them at all...that would be a good option!
A very good option....worked on my parents...but its not the nicest thing to do..LOL

As you said, your an adult not a child, whilst you are only 20 you seem mature enough to do your own thing and at the end of the day its your life and body to make these decisions not your parents. I hope they see sense and support you and DF through this pregnancy and beyond *hugs*