You had sex one day prior to your periods. He did not ejaculate in. So there are least possibility of conception.due to the sex. because by no chance ovulation is one day prior to menses, the sperms are active for 3-5 days. By this time you had already started oc pills.
The white discharge,bloating
after the period might be due to some infection in vagina.Please consult a Gynecologist for it.