Hi there
I would reccomend the same as everone else really. If you can wait a bit longer then do. I became obsessed with testing and got lots of

which was really disheartening.
Unfortunately mine ended in an early miscarriage. Because of this the doctor has said that when I next try (which i have this month), he wants me to go into the surgery for a blood test as they will pick up the hormones much quicker. One of my friends didn't get her

until 16 days after

was due! Everyone is different.
If you can hold out for another week, then do....you can always see about getting a blood test done at the doctors.
Good Luck to you
