need some help

I have downloaded this app along with dinner others to try and find out if I could have got pregnant or the chances of it. my first day of my lady period was June 25 2014 my period ended on June 29 2014 my husband and I had sex on the last day ( was barely spotting)

I am not on any birth control but last night he came in me and I cant figure out all this fertility window thing. just was wondering if someone could enlighten me