if you have high bp going into cycle then i pray for you.
don't go into cycle unless you are already in top shape or you will be in big trouble. fix your bp.. healthy lifestyle. diet, exercise, lots of water and ONLY water, yoga, reducing stress/drama from your life
if your bp is good going into cycle then you need to watch the dosages you run, need support supps and need to be careful about putting on too much weight quickly. if you gain 10 pounds in 3 weeks on cycle then yeah your bp will jump, that is common sense