Hi there, I have understood your concern. I will suggest you the best possible treatment options. 1 ) First of all do not panic. 2 ) As you might be aware that in a woman with regular cycles day 10 to 20 of the cycle is the most fertile period of cycle. If you had unprotected sex in this period, then ther is chance of getting pregnant. 3 ) If you have missed your periods, please get morning s first sample of urine tested for pregnancy. As missing periods is the most important sign of pregnancy. Sometimes there is premenstrual spotting, that can be due to minor hormonal changes. 4 ) You can get gynec check up done including per speculum and per vaginal examination. This will help to rule out cervical polyp or erosion which can cause minimal bleeding not related to menses. I hope this answer helps you. Thanks. Dr. Purushottam Neurgaonkar.