15 weeks along and showing less than my first?

Me

I am 15 weeks along and I have a tiny little something going on, but with my 1st baby I popped out pretty early (around 14 weeks) and it was pretty noticeable. I’m not really noticeable at all, maybe if I was wearing a bikini but it makes me a little nervous. I have an appointment in two weeks with my midwife but I’ll be nervous until either that appointment or until my stomach pops out again