Hello frens i have a problem for you with added personal spice.

I fucked my gf without a condom.

Her period is late by a week.

We did 2 pregnancy tests, both pregnancy tests claim to be 99% accurate as most modern pregnancy tests.

The first test was done 4 days after her period was supposed to come, the second 6 days, both early in the morning.

Both tests came out negative.

Whats the actual probability of her being pregnant? Its obviously a geometric distribution variable but I dont know how to compute it given that reliability of actually knowing if you had a success or failure isn't 100%