All the period symptoms no bleeding!!!! Help!!!!

I had a mc october 19 and my first cycle was November 16th. So since DH and i have been actively ttc. Since stopping bc in february my cycle has returned to 20-22 days. Yesterday on my 28th cycle day but 23 days since my last period i started getting really really painful cramps. But when i went to the bathroom checked expecting af had arrived and there was nothing but brown discharge. No clots nothing. I put in a tampon expecting it to arrive through the night still nothing.....could i be pregnant? I haven't tested because i thought af was here and there was no need. Or could my period just be playing cruel games. I have cramping gas headache and severe nausea. Dont know if its my pmdd or weird symptoms? Anybody ever had this happen?