Thanks for the query.
The possibilities are:
If you had intercourse around the time of ovulation then there is possibility of pregnancy
, this type of pain etc can be seen in early pregnancy while implantation
will be going on.
Some women may have pain of premenstrual syndrome
some days before periods, so that may also be one reason.
So you wait till your expected date of periods and undergo preferably blood test
or urine test for pregnancy to rule out the possibility of pregnancy.