as your medical history suggest that your periods are painful every time , but you have an intercourse during the month without any protection , but its not clear that on which day after your menses you had intercourse that it is possible to be pregnancy
to take place if you have unprotected sex during the period of 12 to 16 th day of your cycle after your menses, otherwise its very rare chances to be pregnant. and there are still 4 days to go for your periods and you are having lower abdomen pain which is always during your periods. So I hope you are not pregnant at this time . Hoping your good time , all the best and take care.