Advice please!

Nichole • I have a 10 year old daughter, Lily, and this is baby #2! Very excited parents, and big sister!!!
I am 5 weeks and 2 days pregnant.  I've had some major nausea!!  But, I have had this crampy/stretching feeling in my low abdomen.  I called the doctor, and they said it's pretty normal.  I don't get my first ultrasound until I am at 18 weeks.  So I'm kind of stuck.   Any advice?