No pregnancy symptoms

So I am eight weeks and two days pregnant. I have had miserable morning sickness (really all day). I've had migraines tender breasts, and nausea. The doctor said it was probably because I'm having twins so this causes more symptoms in some people. This happened from week for two week eight. However, now I feel absolutely nothing and it's making me a little nervous that something could be wrong. Has anybody else had this happen to them?