Ok I've been kinda worried because I found out im bout 2mos. Pregnant and I've been riding roller costers a lot during the 2mos isnt that bad for thebaby?

We just don't know. There has been little research on the effects on the human embryo or fetus of rapid acceleration/deceleration with ascent/descent. It is not possible to say a baby exposed to those physical conditions will be normal; we cannot even say that about a baby not exposed to those changes. What women should do if they think or know they are pregnant is ask an OB doctor before engaging in unusual things.
Don't worry. The fetus evolves well protected, floating in a sack of water (the amniotic fluid) which easily fends off most physical forces impacting a mom's body.