I totally know what you are going through. With my first pregnancy I didn`t have any symptoms at all either. In fact I didn`t even know I was pregnant until I was seven months along. Then when I got pregnant back in June, I had real sore boobies (I wanted to take my off also), smell of food made me so sick, did not want sex at all, I stayed nauseated all the time. So yes, pregnancies can be totally different. I wish you the best of luck.
Indeed they can. There are many women who have said that in one pregnancy they were fine and in another they were sicker than a dog. It might be twins, but only the mothers genes determine this. The father has nothing to do with it.
Every pregnancy IS different. There are people who have two of the same sex and it is totally different, women have twins and had no symptoms you never know there is no rule on symptoms and what it means. I totally understand with the nausea brushing my teeth made me puke and I literally puked all the time for four months straight. No fun at all!! Congrats on your pregnancy.