I am 7 weeks pregnant & I was wondering if it is safe to eat chicken lo mein with msg in it?

Less MSG, better. I don't believe there is a big risk of msg in regard to pregnancy, but generally the less chemicals you put in your body the better especially when you are in early pregnancy. It is regarded as safe by the fda, but I would minimize consumption, especially during the first 12 weeks of pregnancy. Good luck and congratulations!