Hello dear, I understand your concern. In my opinion there are less chances of pregnancy with protected intercourse. The efficacy of method depends on the method used. That is if she is on birth control pill with regular intake the chance of pregnancy are very rare because the birth control pills are effective of all methods. If the condom was used and there is no slippage and tear of condom during the intercourse the efficacy will be good . The best time to test for pregnancy is one week after missed period.The urine pregnancy test gives accurate results if done during this time. The blood pregnancy test gives accurate results well early to urine pregnancy test around 3 weeks from last menstrual period. As it is 7 days late I suggest you to go for a urine pregnancy test. In case of positive pregnancy test the termination of pregnancy by medicines is possible upto 7 weeks of pregnancy and after 7 weeks surgical procedure is done for termination. But take medicines for termination only under strict medical supervision to avoid complications. As it was protected sex the chances of pregnancy are rare. If the urine pregnancy test is negative the test should be repeated after a week. If still the repeat test is negative there might be no chance of pregnancy. And the delay of period in such case might be due to stress induced hormonal imbalance. So avoid stress and relax and consider doing a urine pregnancy test. Hope this helps. Best regards...Dr.Srilatha