My last period was June 30th 2013. I had unprotected sex (withdrawl) July 13th with someone...July 21st I had sex with an ex and he finished in me. I took 2 positive pregnancy tests...I am not sure who the father is. I have not had an ultrasound yet. My period has always been irregular so I can't really count out cycle days. Online there is a conception calculator but I am not sure if this is too reliable. HELPPP?!