I truly know how you feel. I was due for my regular period on Sept. 5, instead I startred spotting on August 31. The next day Sept 1 was very short of a reg cycle, no heavy bleeding but i bleed lightly (off and on) then the next day I was spotting again. We lost a baby last may and has been TTC since. I have tooken 2 home test from Dollar tree and both came back negative. I hate to get excited all for nothing my husband really wants a baby. And even b4 the last baby we had been ttc for over 6 years. I hope everything works in your favor as well as mine.
Go to your doctor,for blood test.
It could be you are pregnant. Depending on what brand test you used, it may not have detected the hcg yet. I suggest trying First Response in a few days and if it's negative and you still haven't gotten a period, I'd suggest taking a visit to the doctor, the pain you have during sex may be from something else.