I'm pg with dc2 and already have a bump - I thought I was imagining it until dh said "Are you sure of your dates?!"
Probably being paranoid but when I found out I was pg I was having implantation bleeding (didn't get that with dd1) and "felt" the implanting (mild cramps) which I seemed to feel in 2 places. DH is adamant it's twins. I had an identical twin but that isn't hereditary so don't think that makes a difference.
Am I going mad? Did anyone else have a bump this early?