I prefer you should wait for few more days. You should get the periods after two days of stopping the tablets. Breast can be painful because of the tablet Modus
. It may be a symptom of pregnancy
as well since the urine and blood tests are negative the chances is less likely. If I were your doctor I would asked you to wait for a week and test two more times before prescribing the MODUS.
Once the periods are resume you will hve normal cycles.
All the best.