What Causes Delay In Menstruation Other Than Pregnancy?

Hi, may I answer your health queries right now ? Please type your query here... hi i have a feeling that i am pregnant i have done several tests and they come back negative. My period has been and gone but i have been spotting but only when i go to the toliet and wipe. there is nothing on my pad so am wondering if i am pregnant or not. is it to early to tell maybe