Q: I am 13 DPO and my HPT is negative. Could I still be pregnant?

A: Even with a negative pregnancy test on 13 DPO, there is still a chance that you are pregnant. About one-third of pregnant women test negative on 13 DPO. With a negative HPT on 13 DPO you still have an 8% chance of being pregnant.
Sometimes you could miscalculate when you ovulated and when you expect your period. Or implantation could have taken longer than expected.