I agree with your mom!
I've been pregnant with boys four times, now. The morning sickness was terrible. It's almost like having the flu for several months in a row. No joke. I'm in month 6 and STILL having trouble with it (though not as frequent).
At least, this is how my body has reacted to male pregnancies.
My daughter? N-O-T-H-I-N-G. No sickness, and I had energy through the whole pregnancy. I even made it to the gym multiple times a week up until I gave birth to her.
The boys? I became good friends with zofran and phenegren.
When people asked me if I was going to "find out" what we were having...I told them. It's a boy. I know it. Sure enough, first ultrasound: BOY!
My husband says I must be allergic
Bah.
If it keeps up, I'm betting it's a boy for you! Keep us posted when you get the ultrasound! How exciting!