I think i've felt like this since first finding out i was pregnant. Whenever we have an OB appointment or a scan it eases my mind and i'm ok for a week or so and then the worry starts to creep in again - we got to hear the heartbeat yesterday which was so great as i was really starting to worry. I don't really have any symptoms and i kept thinking "maybe my belly's just getting bigger becuase i've been eating so much!". I'm slowly getting my mind to relax and am trying very hard to keep those negitive thoughts away.