Could this be morning sickness?

My period is due on the 26th, it's currently the 14th. I feel nauseous, and even had a little in the back of my throat. I haven't eaten anything strange (I had fully cooked eggs for breakfast and some tea with stevia, felt perfectly fine this morning, although hungrier than usual when I woke up). For the past 6 months my fiance and I have been using nursing as birth control, my period started up regularly about 4 months ago and we decided maybe having our kids close together wouldn't be so bad until we realized that taking care of a toddler AND an infant on our wedding day probably wouldn't be the greatest idea so I'm planning on starting an IUD or something after this menstrual period (I'm saying all this to avoid the birth control information that I know some people are bound to offer). I'm still nursing full-time (my baby is almost 7 months old, he only has 2 tbsp of solids 3 times a day and nurses 6-8 times throughout the day, although he sleeps 8-10 hours at night so I don't think breastfeeding is having much of an effect on my fertility). I really am not an expert on these things and I just wanna know if anyone else has been in a similar situation? Can morning sickness start this early in a potential pregnancy? In my first pregnancy I had it only twice, in the 2nd and 3rd months, and it only happened when I let myself get too hungry...