Can I be pregnant if I'm 16 days late?

I'm sixteen days late am I pregnet?? I really need help and I took those store bought test but they all comeback - so can they be lying?? Because if they are *shakes fist*

Anything is possible, and home pregnancy tests can be tricky.
One thing is for sure.. Because you may just be having nervousness and be stressed, which could also cause symptoms like nausea, cramps, sickness, weight gain, cravings, moodiness, irritability, things like that..
My suggestion, is to consult a doctor, and have a medical professional give you a pregnancy test.

There's no way we can know if you are pregnant or not. If you're not sure, talk to your ob-gyn about it. Make sure you're using protection in case you are not pregnant.