So I am 3 days late for my period and this month i can actually say i dont feel like its coming. I have HCG test strips i bought in bulk, yesterday i took one and a very very faint line showed today i took one and a faint line showed a lil darker than yesterdays. Then i tested with a walmart test and a clearblue digital test and they were negative. I dont understand, the only thing I can think is maybe the hcg test strips are more sensitive or they are BS. Any advice? Has this happened to someone else before?