I have high blood pressure - you can have that without having protein. In my first pregnancy I didn't get pre eclampsia till 38 weeks - but had high blood pressure all the way through.
This time I am on labetamol (sp?) to control my bp and apart from a blip the other week where they had to double my dose it has controlled it brilliantly. They start you on a low dose 100 mg (think its mg) twice a day - but my consultants reg told me you can take up to 2400 mg a day and they can combine it with other drugs.
High bp doesn't necessarily mean lots of stays in hospital though PE may. I would get your bp checked asap and ask them about medication (I have no side effects from my tablets, have been more tired since they doubled my dose but that may just be end of pregnancy as I am 37 weeks).
It will be a vicious circle if you worry you are more likely to put your bp up or keep your headache going - try and drink loads of water as if its not bp it may be because you are dehydrate (i suffer badly from headaches and migraines when I am not pregnant too). Best to get checked and put your mind at rest.
I have had headaches this pregnancy, dull ones on my temple that last for like 2 days!
Also I have had a migraine.. haven't had one in 8 years!
I could just be the hormones giving you headaches, or being dehydrated/not drinking enough.. it doesn't have to mean that you have high bp when you have a headache!
Worrying and stressing about it ain't going to help, so just try to relax
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