Hello dear
Understand your concern.
Pregnanacy may be possible but chance is very less.
For safer side confirm the
pregnancy by Pregnancy kit 7-10 days after missed period .
Or better to do Blood HCG level or USG that is very sensitive.
Another reasons may be side effects of
contraceptive pills like:
Intermenstrual spotting, Nausea, Breast tenderness,
Irregular periods, nausea,
headaches or weight change, Headache,
Malaise, weakness
Weight gain, Mood changes, Decreased libido, leg swelling and pain
Advice:
Take tablet meftal saps three times a day for 2-3 days or when pain
All this side effects will decrease after regular use of pills as body get adapated
Take healthy diet
Avoid excessive stress, alcohol, salt and caffeine.
Do regular exercise.
Use safer sex practice and maintain hygiene after and before sex.
If persists , you can use other contraceptive methods like condoms
Hope this may help you.
Best regards
Dr. Sagar