twins?? anyone had them or having them.

I am 10 weeks pregnant. My stomach is always upset constantly i always gag but i never throw up... i am just a little concerned because i didn't have this with my other 2. I have a 3 year old and a almost 10 month old. I feel like something is different this time or maybe i am just going crazy.. I am so sick of feelinh sick. I never got morning sickness or anything with my first 2 and i don't remember my stomach hurting like this with nether one of them my US isn't until the 16th.. I swear I've felt a little movement as well.