Tellytubby - congrats on the pg & congrats on the willpower you must have to have not told the world by now. I know with my first I was busting at the seams (literally) to tell people. 12 weeks is considered the safe mark so you are well & truly past that.
As to others opinions about you not being married, still with the folks - who cares what they think. You & DP are obviously committed to each other (it's not like you've been together for 2 minutes!). Just enjoy your pg, try not to stress & make some plans about being in your own place in plenty of time for bubs arrival! All the best!