Sometimes HPTs work before AF is due, but sometimes they don't! I tested 2 days before AF was due with DS2 and got a BFN, I tested the day after AF was due and got a BFP. So, just be prepared that if you do a test you may get a BFN, but could still be pg. It can be very disappointing if you test too early.
I say go and buy one today anyway and use it tomorrow instead! Good luck
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