Hello,
Thanks for writing to DoctorSpring.com with your health concern.
A lot of women do not have a period while on birth control. So do not worry.
You have been diligent with the pill, in addition to using condoms / pull - out.
Your chances of pregnancy are nil , given your negative home pregnancy tests.
Stress, the new birth control, travelling, changes in your diet or sleep patterns - can all lead to a delayed period.
So do not worry. Continue taking the pills regularly without missing any pill.
All the best & Please feel free to discuss further.