very confused but hopeful can anyone help??

hi, me and my fiance had intercourse 6 days after my period stopped, what I didn't know is that the day we had intercourse that it was on my fertile day. well I have been having wet/sticky discharge since the day after my period which ended on the 5th of July (I started my period on the 1st of July) and here it is August 2nd and I'm still having discharge. me and my fiance had sex on the 11th of July and every since that night I have had a headache every day I would take something for it and it comes right back when the meds stop working which is not normal for me I have also been having cramps for the past four to five days and lower back pain. I'm not sure what is going on yesterday and day before yesterday I had a little bit of a milky looking discharge it only happened once yesterday and once the day before that. I'm confused and wondering if I could be pregnant or what is going on. can someone please help.