Hello dear
I understand your concern
Pregnancy is not possible as you are on the birth control pill.
Birth control is very effective in preventing the pregnancy (just 0.5 % failure rate).
Efficiency of pill dose nit affected by taking one pill at late night.
Your symptoms could be due to
hormonal imbalance, premenstrual symptoms.
You can symptomatic treatment for that:
Take tablet
meftal spas, gentle breast
massage with evening prime rose oil.
Maintain proper pelvic hygiene, take proper rest, drink pletny of water, eat healthy diet.
If period will not come in next 7-8 days then consult the gynecologist for proper examination.
Hope this may help you
Contact HCM for further health query
Best regards
Dr. Sagar