I Am 22 Yr Old Female And Guess I Am

I am 22 yr old female and guess I am pregnant. I skipped my period last month i.e. 24th July. I felt white discharge for a week during my period dates and also felt the feeling of periods. But there were no periods. I am having sore nipples and frequent urination. My last Intercourse was on 6th July and 29th July but the semen was not ejaculated into my vaginas. I had done pregnancy test at home on 10th August in the evening and 15th August early in the morning. Both the tests were negative. Am I pregnant?