No....not mistaken for contractions, but definitely have had the worse gas pains of my life while being pregnant, now I know how babies feel with excess gas :( no wonder they cry.
I had a lot of gas with both of my first two children...I would get sharp pains with mine...and gas in my chest. I would talk with your Dr. about something for the gas if you get bad pains...I ended up taking gasx and prilosec for mine. It helped! Good luck!