If you don't have hypertension (HTN) right now, don't worry about the BP increase. HTN is not diagnosed just b/c in one reading you're over 140/90. There are many factors that play into it, stress, anxiety, diet, exercise, what you were doing before you took your BP, some supplements will increase BP, etc.
Now if you do have HTN, one of the biggest things in diet that needs to be changed is sodium intake has to be lowered. B/c of the water retention. Creatine has a similar affect.
Don't worry about it.