Thanks for your question on Healthcare Magic. I can understand your concern. Possibility of pregnancy is less because you had sex in safe period. But better to first rule out pregnancy, so get done urinary pregnancy test. If this is negative then no need to worry for pregnancy. Lower abdominal pain, swollen part, whitish creamy discharge, menstrual irregularities etc are more suggestive of infection due to sex. So possibility of sexually transmitted disease is more in your case. So better to consult gynecologist and get done clinical examination of vagina and microscopic examination of discharge to identify the causative organism. You will need antibiotics and other supportive drugs. Better to avoid unprotected intercourse and use condom. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.