hopefully I will not get reemed for this . . . . . but (with doctor's permission) I rode pretty much everything, except TOT and RnR. I rode EE twice, splash, btmr, space, kali, TT, etc. my doctor told me to ride what i felt comfortable with, so i skipped what i felt i should. I was 11 weeks.
Ask your doctor, even if you're afraid of what they might say, there are many many variables that can affect a pregnancy and it's risks. . . .age, past pregnancy, health, weight, etc.