My period was from aug16-20 me and my bf had sex the day after and he came in me ..we broke up and i had a one night stand with an ex on the 27 we used a condom but it broke .. i went to a clinic on sept 10 and they told me it was to early to detect a pregnancy cause i was suppose to get my period on sept 13 but they did the test anyways and it turned out i was in fact pregnant is there anychane that my bf is the father ??
More than likely your babies daddy is your ex's BUT you won't know 100% unless you do a DNA test after the baby is born. You may be one of those females with a shorter fertility cycle which then would put your BF as the daddy but that is guesstimating only as I said before a DNA test will tell you exactly who the daddy is.
Sorry I couldn't help more.