Few questions..

Ok, so I'm 17 weeks as of today and I've had lightning crotch for the past week (feels like my vagina was kicked with a steel toed boot), is it normal this early? Also, I have a lot of white & watery discharge. Enough for a panty liner..normal? And last, anything I can do for sciatic nerve pain? I'm currently using IcyHot. 
Thanks! Oh and I don't have an ultrasound until July 23rd..