where is it!?

I've had my period for a good four years now, and I've never once missed a period, but my period was due on the 1st of August and I've got nothing. No spotting, no discharge, nothing. But I've been getting all the signs, sore boobs, cramps. It's just there's no blood? It's a good month late and now I've overlapped my next period and THERES STILL NOTHING. Ladies please help me!