Mine were really sore too but on and off not constant, but the test said neg.... until about 12dpo I think?? Only + came when I used the FR white plastic handheld stick tests, and still today any other brands and even the dipsticks of FR are only just very very faint(17dpo) But the plastic stick one is two strong lines!

Fingers crossed for you, 10dpo was a realy hump day hard work time for me mentally. THinking of you and hoping it is good news for you x