I don't think there is anything wrong with it, but you will likely have a tough time finding someone as you're putting your relationship on a timetable. That is, he will be able to get to know you and have a good time with you up until you give birth, and then much of that goes out the window as your time then goes to being a good mommy. In a way it seems unfair, but as long as you're upfront and honest, there should be no issue. I would do as the other person said and be upfront and honest because if you aren't showing right now its not really fair to get a man invested in you and then a few months down the road say "surprise! I'm preggo!" That would be upsetting news to him and would be playing with his life. Good luck!