I am 25 and I had a stress echo today. Is it normal for my BP to go to 170 over 70 while I hit 185 bpm? Resting BP is 120 over 80 give or take

Yes . Your blood pressure should rise with exercise. That BPM is over 95% of maximum heart rate for age. So your stress echo should have a high degree of sensitivity for picking up mitral valve prolapse. !70 is a tad high, but the 70 was very good. Most likely they had to really increase the incline to get the rate up that high. Increase in incline increases the systolic component.