unprotected sex, improper sex .......

Hi im 24 year old girl, last month may be on 26th, i hd unprotected sex with my boyfrnd. That was improper sex, coz very small portition his sperm gt inside me & for 2-4 seconds and i refused him to do so .... That month i had my date on 28th, at the sametime i was taking my medicines for Leucorrea (vaginal discharge) ..... I missed my date almost 1week, (its on 4th) .......

Then almost 2weeks later on 18th, i again started bleeding, less in amount ........

Now im confuse tht isit pregnancy symptoms ???????? That month i missed my date coz of pregnancy or coz of my medicines of Leucorrea ??????
And one more question, after doing sex how many days later women can confirm (pregnancy test) tht she is pregnant ??????? %-)

Thanks n take care :-)