So i usually have my period around the 14th of every month. but im a week late. i've had pregnancy sym but took 4tests, but all neg. had light bld 2da?

Ovulation issue: You may not have ovulated this cycle causing a late light breakthrough bleed. However, since a small percentage of women have an issue that always causes them to have negative urine pregnancy test, would suggest you see your medical provider and get a serum (blood) pregnancy test to confirm that its just an annovulatory (no ovulation) cycle. If this persists you may need other blood work.

Late period: Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; Over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives & other meds, Illegal drug use, breast feeding, hormone imbalances and medical problems (i.e., PCOS). Pregnancy is #1 reason.