If the time comes when the period does not come and the crotch bone is sore, it could be pregnancy, but it could also just be a delayed period. If a woman has recently had sex and her period has been delayed for more than 1 week, she can buy a pregnancy test for a preliminary test or go to the obstetrics and gynaecology department of a hospital to have a blood test for hCG, which can determine whether she is pregnant more accurately.