Hello dear
I understand your concern
Irregular use of birth control pill in your case does not protect you against the
pregnancy.
Birth control pill should be taken from the 1st pf period and taken regularly at the specific time till the pack is over.
So there may be chance of the pregnancy if you had unprotected sexual intercourse in fertile period of the cycle.
Contraction could be due to premenstrual symptoms and pregnancy.
Definitive symptoms of pregnancy is absence of the period.
If your period will delay by 8-10 days from the normal expected period date then go for urine pregnancy test and or blood
HCG to confirm the pregnancy.
You can consult the gynecologist and get examined for painfu; contraction.
Tablet
meftal spas will help you and get if after examination
Avoid
stress, take healthy diet, drink plenty of water and maintain proepr pelvic hygiene
Hope this may help you
Contact further if follow up needed
Best regards
Dr. Sagar