More pregnant than midwife thinks

Rachelle • 23 years old, 3 years married to my childhood sweetheart, we have a little girls who's nearly 2 and due a little boy in November :)
Hey everyone, i found out i was pregnant 2 weeks ago with my second little miracle after being told I'd not be able to have children. I've been to the midwife and done the whole when was your last period etc to date it, which makes me nearly 8 weeks, but i told her the last "period" i had only lasted a day and was really really light which wasn't normal for me. Anyway the last couple of weeks ive been feeling tired, rough etc and ive been feeling fluttering in my tummy and when i lay flat i can see a small bump moving around and sort of flicking so im wondering if i could be more pregnant than they think i am? Im not due to have a scan for another 4 weeks but even my mum has said im definitely showing a little bump as i am pretty slim 5ft 4 and 8stone, should i ring the midwife and mention it? What would i say? Im worried they'll think im "imagining" it lol any advice?