This secret is going to be hard to keep

So last night I took a pregnancy test and it was positive so went to the doctors today and we think I’m around 4 weeks along. The problem is my boyfriend and I have decided not to tell anyone yet but it’s going to be hard since already my appetite has increased. I literally just ate an entire footlong sub in one sitting and I normally only eat half and that’s it. We currently live with his parents and his mom is the one I’m worried about.