Disappearing symptoms??

✨✨Sian✨✨ • I'm 22 my fiancé is 24, we have a 2 year old little boy and were expecting our second baby in September 2016!
I'm almost 8 weeks and my symptoms have disappeared minus the sore boobs and bloating. Nausea, back ache, headaches the lot, all gone. I've had no more cramping than normal and no bleeding, should I worry?
I feel so silly as its my second baby but this didn't happen with my first?