My last AF was on 21st January. Arrived a week earlier than usual and my cycle is usually 28 days. Last 4 days instead of the usual 7.
For the past 2 weeks I have been having back pain, headaches, slight heartburn which i never get and my stomach is really bloated, I've had to go and buy more clothes since I went down to 1 pair of trousers that I can just about squeeze into!!
DH went out and bought a HPT and it came up BFN, which I did expect since my next AF is not due until 18th Feb.
Should I wait and see if AF comes on the 18th and test again?

Yes I would wait, and test again, tests are definitely more accurate when you due for your period or miss it, and if you are pg you may not have enough of the hormone in your urine for it to be detected. wait a few more days and test again, and good luck hun!

Your symptoms could be pregnancy related.I think you should wait until u miss AF to test.I've always heard that is the best time.Good luck!

agree, wait until AF is late to test again. Lots of luck

have you just come off bcp?

agree with others..... wait until ur af is due and test

good luck.... and keep us posted!

Good luck!

Good luck, I hope those are all positive signs for you

good luck

Good luck