Why isn't my period starting?

I'm trying to get pregnant and my period is now 11 days late, just 3 days ago I had a blood and urine test done to see if I'm pregnant both came back negative. Why isn't my period starting then?

if your not eatting right then you dont get your period on time

ok well it has to be 4 to 8 weeks to come back positive if you were pregnant thats what I heard anyways im 14 I got pregnant but I had a miscarriage but it still came back positive I was 14 weeks =C

Periods can be irregular due to stress, eating, work, climate, you name it.

The act of trying to get pregnant causes a lot of women to skip periods. . .hence why so many ladies have now started using ovulation measurement devices to tell when the best time to conceive is.

And if it's not your time, try try again.

hi you guys thanks for the info my period just started and im in sooo much pain but hey atleast now my period started and I can stop stressing