 [ Symptoms ] is pregnancy possible if you start a period 19 hours after sex bearing in mind that the period was about a week early i had unprotected sex at around 5am on january 1st around 11pm the same day i started to bleed lightly light pink it continued on and off until the third and did not become heavier it is been accompanied by some light cramps but nothing i would really worry about the last time i was pregnant i also had a very heavy period and was still found to be <negative_smiley>9 weeks pregnant so i am just being cautious this time [ Disease ] hey you are better off seeing a medical provider first so you can be properly examined diagnosed and treated most sinus infections assuming you have self diagnosed correctly are viral and do not require any antibiotics if there is a bacterial component you may need to treat for more days have from leftover prescriptions not treating an infection completely encouraged resistant organisms so it is entirely possible that neither one of those antibiotics would be appropriate