Thread: how do you know when your fertile?

i had unprotected sex on day 10,he pulled out and came on the lips of my vagina but then rubbed it in a bit,then again on day 17 but he came inside me,i think i would have ovulated around day 14 or 15,i have a regular 28 day cycle,whats the chances i was fertile and could now be pregnant?im due on tomorrow,but all i feel is sore boobs and wind,not my usual pms signs,help!!!!

http://www.babychoice.com/Other%20Information/Ways%20to%20Chart%20Your%20Fertility%20Pattern_fic hiers/MenstrualChart07.gif