I got my period on the 5th july till july10th.i had unprotected sex on the 18th july and he came inside me.what are the chances i might fall pregnant ?

It's possible : Day 1 of your menstrual cycle is the first day of bleeding. Ovulation normally occurs on day 14 of your menstrual cycle. It may occur a little later if your cycles are longer than 28 days.

High: Ovulation is likely to take place on day 13 to 14 on a regular 28 - day cycle. I would recommend avoiding alcohol and smoking until you get a negative pregnancy test. You should also be on prenatal vitamins. You will have to wait until your next period to test for pregnancy at home.