It sounds like you suffer from anxiety and went to the lie in order to alleviate that, but instead you have dug a deeper hole for yourself. I would leave this job if I were you, and start fresh with no more lies. You are not the first woman to lie about being pregnant, nor will you be the last, but it is a hard lie to keep going because people eventually figure it out...or you have to lie again and say that you miscarried. These lies will likely cause you more anxiety than the original situation you were so afraid of!

I would encourage you to seek therapy for this issue, the anxiety and the lying. You can address this, and overcome it.