I have been trying to get pregnant with my second child for about 4 months with no success. I have a prior history of endometriosis .. had a laproscopic procedure approximately 12 years ago... and then prevented return by remaining on birth control . I came off of birth control approximately four years ago when I started trying to get pregnant with my first child. We were successful on our first attempt. Over the past few months, I have been having irregular periods and severe pain for a day to a day and a half during my periods. My period typically lasts for five days with two to three of those days being heavy bleeding . Is it likely that the endometriosis has returned and this is what is causing my difficulty in conceiving?