Has anyone went through this ??? worryed?

ok i tthink im preg and im two months late on my period this is not normal my periods was alwasy normal ..i been havin mild cramps for a couple weeks now and i had took a hpt and it was negaitive and then i wen to doc and they did a blood test came back neg.....then i went for a pap and he ordered me a nother preg test didnt get results yet i be havin back pains in the middle bottom of my back and i really dont have sore they just tingle i dont have mornin sickness either im very moody and i was just wonderin if anybody had this problem and was pregnant can i here your stories please help