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How can I get pregnant if I have irregular periods?

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I am trying to concieve however. I have a very irregular period. My last menstrual period took place around July 29th sometime and I havent had one since...however my boyfriend and I recently tried performing sexual intercourse August 15th.( sorry to be so blunt) and I took the first response test a day later. the results came back negative but I am wondering is there still a possibility I can be pregnant because we really want a baby. I mean it is hard to detect when I am ovulating due to my menstrual cycles being irregular. I just want to know. what should I do? How long should I actually wait before I give up and realize that I am not pregnant? and could I still possibly be pregnant?