Dear Doctor, I Am A Married Woman. I Have A

Dear doctor, I am a married woman. I have a regular menstrual cycle of 27 days. I saw my period on the 18th day of August 2015. For the first time in this cycle I had an unprotected sex with my husband on the 8th and 9th of September 2015. My period supposed to come out today being Sunday, 13th of September. Could it be pregnancy? Pls we are. It ready to make another baby I already have 5. Pls doctor if u suspect pregnancy what medications do u subscribe I take before the baby is fully formed. Thanks