Im 22 and i am 27 weeks pregnant with my second child. my bmi is high. i am in fear of having a stroke. is this rare?

Rare but happens: This would be more of an issue if you have problems with high blood pressure than a high BMI. You can discuss this with your OBGYN's staff. BP self monitoring devices are available for you to keep track of this at home. If you BP begins to trend high your docs can treat it early & keep you on track for a healthy delivery.