Yulia, the first trimester is the hardest to get thru! Hang in there- The GI problems are normal! Believe it or not. You will probably have GAS all through the entire pregnancy. I had constipiation, diareha, and gas. I'm 17 weeks, and still have a lot of gas, and although I'm not constipated anymore, I still have to "work" at going #2! TMI (sorry).....
Ahhh the joys of being pregnant!
By the way, the cramping is normal....I had it the first trimester, and as long as you aren't bleeding...all is fine! Just that little baby...GROWING!