Coffee or not and WHY?

I have a cup of coffee not everyday, but every other, if that. My doctor says it's okay to have up to 200mg a day. At times I don't even finish my cup. There are many days I can do without it no problem at all, but then there's other days that I need a cup to wake my butt up especially that I have a 2 and a half year old boy. What are your feelings about coffee while pregnant and tips to boost energy naturally?