ok i had my period jan 9th then fed 9th my period last for five days(till the 13th of feb) i had sex wit my boyfriend on the14,15 then had sex with someone else on the 17th(which is the 9th day of my cycle)i then had sex wit my boyfreind on the 18-20 and on 22 can i have conceived on the 12th day of my cycle?? i bought ovulation strips to find out when i would ovulate. i didnt get positive resulsts till the 24th of feb n continued to have sex with my boyfriend when did i conceive??