Thanks for the query.
Just go for a urine pregnancy
This test becomes positive within a week.
If it is negative you can be 100 % sure that you are not pregnant.
The dark marks can be removed by applying a depigmenting cream like hyde cream.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.