Was going to suggest hernia too. Did the MW actually look at it? If not get e GP appointment. Nothing they can do about a hernia whilst your a PG mind, but if it doesn't go away afterward you may need a small op.
Well I thought that but i didn't think a Hernia behaved like water retention. (like when you have bad water retention and you stick your finger on it and when you move away there is a dip, it's like that)
Sorry you did say in your OP. My belly button went really wierd when I was pregnant. It could just be one of those weird things no one tells you about. If you are worried go see your GP, its probably what you MW would have told you if she bothered her arse to even look at it.
Tbh, I can't blame her she's so busy. She is the midwife for two whole towns on her own. The only way I can change is if I'm classed as 'at risk' and then would have to go to the hospital for my appointments.