Should I be suspicious?

So 3 weeks ago I had from what im guessing, a one night stand and a couple of days after it happened I had symptoms of a possible pregnancy. I was freaking out the entire week. The symptoms seemed to stop so my stress decreased but I look at my stomach in the mirror everyday because I feel like im seeing a bump but im probably psyching myself out and it very well may be gaining weight from stress. Anyways he snapchats me yesterday asking me how my mothers day is. I kindof got a weird feeling after that like was that his plan? Idk what do you guys think? It could very well be a simple innocent question but I want to hear y’alls thoughts on the matter