A lot of info

So my husband and I have been trying, but not hard core trying to get pregnant for almost 3 years now. Since high school I have had irregular periods. And when I say irregular I mean I wouldn’t have a period for an entire year. Then I would have one fire 10 days and go through a whole box of tampons and pads in 2 days. My gyno always told me it was because I was a dancer and played volleyball. But my mother and I didn’t think that could be possible. I got in birth control. That was 2009. 2012 I got off birth control and just practiced safe sex. My irregular periods got worse, this time I had them for a long time. I was bleeding everyday for a year. I might have 2-5 days here and there that I wasn’t. When I went back to my gyno all they say is I have PCOS. They did an inner ultrasound and found nothing wrong. It’s hard to track my periods and when I ovulate in here because they are so irregular. And they last however long they want to. Lately they have been a lot better then usual so that’s good. But I can’t get pregnant!😞😭 meanwhile my sister has 3 children she can barely take care of! Which I love her and them as my own. But it’s so frustrating to see how fertile she is and I can’t even have + on a pregnancy test! Just that alone would make me feel a little better. Because then I would know I was able to get pregnant. Is that crazy???