TWW 2 - Day 15 ugh

I'm pretty sure it's my period.  But a very strange period.  So maybe there was some nonviable action going on in my uterus.  My period hasn't started properly but it's like a start stop bit of smudge, bit of color, then nothing, then something then nothing.  I'm feeling a bit crampy though.  And all tests are negative.  Including the one I took this morning which was a clinic test.  The clinic wants the official test to be tomorrow.  Which is fine.  But I have no reason to think this is anything other than my period.  I will test tomorrow to confirm, and be waiting for my period to arrive properly.  Then it's a month off before starting my first IVF cycle.  Ho hum.