What Causes Vaginal Itching And Constipation After Taking I Pill?

Hello doc My gf and I had unprotected sex and she took an ipill after about 11 hours. We had unprotected sex after that on the next day by withdrawal method. After 4 days now she feels a bit of itching on genitals. Also urine is more frequent although no bleeding has been observed since then. She feels constipated and gastric. I can t understand is this any symptoms of pregnancy. Her last periods were on 11th last month and we had intercourse on 23, 25 and 26. Please advise we are worried Thanks