Mel, before I fell pg with my DD1 I felt her spirit buzzing around me quite a lot and several friends that I meditated with regularly saw her too. Understand that in the incarnation process, the baby's spirit starts moving into your aura quite gradually - often they need to move into your aura by several layers before they can actually connect into the physical within your womb. With DD2 I felt her getting closer (ie moving in through the auric layers) for a couple of months before falling PG. So it could be that people are sensing a baby's energy around you, coming closer.

Good luck!