3rd pregnancy weirdness

I have a 4 year old, horrible morning sickness, fatigue, every pregnancy symptom you could think of with her. I have a 6 month old and same with her pregnancy. In between my 2 daughters I had a very early miscarriage. We found out we are now expecting and I am ten weeks. I exclusively breast feed my 6 month old. My problem is, I have no pregnancy symptoms, no morning sickness (which is the big wow for me) and nothing else! I'm a little worried, ultrasound isn't for a few more weeks. Has anyone else had a pregnancy like this, when all their previous pregnancies hit them hard?