Cramps and cravings!

To start, why is it that i crave stuff like pickles or salad with ranch dressing and then after i eat it, i feel sick to my stomach? I use to love eating and now I'm afraid everything will make me sick. And today I've had very slight stomach pain, almost like cramps? I'm not constipated or anything and when i logged it, i didn't get any feedback about it. Should i be worried? I'm pregnant with my second but with my first i didn't have any problems, not even nausea.