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Most women ovulate 14 days before their next period so going by your 18day cycle you probably conceived on day 4, which means you could have gotten pregnant from the sex on the 1st or the sex on the 4th as sperm can live several days inside you. I noticed you have posted the same question several times, are you confused as to who the father is? Is that why you are so desperate to know the answer? Generally at your first ultrasound usually done around 12wks they can give you an estimated date of conception which in turn gives you an estimated due date. If you are worried about who the father is unfortunately the time frame in which you had sex & conceived is too close to guess & you will have to get a paternity test done.