Welcome to HCM! I have read your question and see that you are preganant, and have developed headache which increases with contraction, and there is blurr vision. I can say from my clinical experince that you should get your blood pressure checked and meet your gynaecologist. this seems to be elated to high BP and possibily increasing ( as now you also developed blurred vision). Only minor possibility can be that it is a migraneous headache, which can be managed easily with some pain killer and head massage, but we must rule out High BP first. but you have not mentioned that you have ever had such headaches in past.... So, please go and meet a gynaecologist / or a GP Hoep you get well soon Feel free to ask more questions Dr. Manisha Gopal