Still No Chance?

I've done an UPT test this morning..and it was negative..:( sad..sad..sad..it is the 28th day after my last period..huhu..yesterday actually i had some signs that my menses will be coming soon...stomach cramps sometimes...err..last week I had a great pain on my left abdomen..err..just after my fertile days..I don't why as I didn't go seeing the GP. Strange, though as I've just seen on the Sat that there's cyst at all..I though maybe the endo lesionss...errr..or maybe somekind of bladder infection as i found it difficult to urinate after that. But after a night it turned to be OK...what is it?