Weight gain too fast?

Hello mamshies. At the start of my pregnancy I was 42kg, nung nag18w ako, 47 kg agad and I just started gaining weight on week 12, after mawala ng sobrang morning sickness ko. In 6 weeks I gained 5kg. Masyado bang mabilis weight gain ko? Normal lang naman kain ko nung 12-16w, medyo dumoble kain ko ng 16-18w. And di ako nagkakakain ng sweets or nainom ng malamig that time I'm 19w4d now and ito pic ng tummy ko.. too big ba for almost 20w?