Just be careful with the BP check.
Firstly GP's don't always know what to look for, if a GP takes it, you decide if it is obivously raised from your previous reading, or even if it a lot higher than your booking in reading, go to A&E, don't wait it out.
Secondly, a lot of the pharmacies that do these 'free BP checks' use electronic machines, these have proven to give pregnant women low BP readings, which can obviously be very misleading.
You can buy the protein test sticks, but, I think (from memory) you can't buy them from the chemist, you may have to order them online (I know I did) however, MW's will never act on any home tests you do, and obviously there is time wasted in waiting for them to be delivered.
Do you have any swelling/stomache ache (other than the BH's!)?
Lastly, do not wait with this. As I said, it could all be nothing, but it could all be everything. You need to get it checked out today. A&E if needs be. (FWIW, I had PE, if I were you I'd have already been at A&E, and I am not one for showing up there for nothing!)