Parents too controlling?

I am 20years old,me and my boyfriend(25 years old) have been living together alone for over a year and together for a year and a half. Recently my guy told me he will be ready to have children soon and I feel the same way, he let slip he is going to propose to me in a few months (very excited!) The other day i went over to my parents and I tried to talk to my mum about the fact it may all happen soon and she acted like a child walking off when trying to talk to her and when I said we may be pregnant before married she said we need to be married first even if I am months along by the time we do it! Is it just me or should I not listen to how my mum feels becuase it is making my sought myself?