It depends on the symptoms your experiencing and whether you had unprotected sex and whether your period is late. If your period is late and you had unprotected sex then yes, you could be pregnant. Do a test when your period is due or three weeks after having sex. take care.
Late for your period is the only thing in your question that matters with pregnancy. If you are late, take a pregnancy test or go see a doctor. The vaginal infection has nothing to do with you being late. Spotting after sex happens sometimes when you are pregnant.
Yes you could be pregnant if you are having unprotected sex. Symptoms are usually nausea, vomiting, and breast tenderness. If you are pregnant, you could be threatening to have a misscarriage, or not pregnant and having a late period.