T.R.
Well, if there is more than one in there, there is nothing "different" you should be doing right now anyway. You should just talk about this concern with your Doctor when you go in. My first pregnancy was "normal" all the way through until my first ultrasound at 20 weeks - that is when I found out I was having twins. My midwife didn't "think" to listen for another heartbeat after she found the first one! And I had not taken fertility pills or had a history of twins in the family (although it is only the mother's side that counts). Needless to say, I switched to an OB/GYN after that. Of course everyone else thought I looked a little big, but no one wanted to hurt my feelings, so they didn't say anything. There is no way to know unless by hearing more than one heartbeat or by ultrasound, so just keep eating well, get enough water and sleep and things will progress the way they want, one, two or more babies! Congratulations and good luck!