Hi Dr. Purushottam welcomes you to HCM virtual clinic! Thanks for consulting at my virtual clinic. I have carefully gone through your case, and I think I have understood your concern. I will try to address your medical concerns and would suggest you the best of the available treatment options. 1] In a woman with regular cycles most fertile period of the cycle is between day 10 to 20 of the cycle. 2] Unprotected sex in this period can lead to pregnancy. 3] A week within the date of periods should not lead you to become pregnant. But as you have said you have started the pills a bit late; if have passed your date of cycle ; I will suggest to get morning s first sample of urine to be tested for pregnancy. 4]Even if you are pregnant, you can opt for termination with medicines safely till 9 weeks of pregnancy. 5] If test is negative, your symptoms can be due to PMS- premenstrual syndrome. For that Vitamin E, PRIMROSE and B LONG F each one daily ofr 2 months will be of help. with negative test , you can simply wait for periods. I hope my answer helps you. Thanks. Wish you great health. Dr Purushottam