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.
Go to your doctor,for blood test.
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.