Hello, Thanks for writing to us. You did unprotected sex during your ovulation or fertile period. Therefore, there is high chance of being pregnant. Here, I suggest you to undergo one home pregnancy test to rule out pregnancy and implantation bleeding (brownish discharge). On positive test, one TVS scan is also advisable. Other reasons are endometriosis, old blood, endometrial tissue, hormonal imbalance, stress/ depression, irregular diet habit, vaginal/ pelvic infection etc. Please consult with your gynecologist for next level management of the case. Maintain genital hygiene. Avoid stress. Practice safe sex in future. Good luck.