Hello, I've not had cancer, but I am worried about my periods and GPs just seem to shrug it off. 

For months, my periods have lasted over 7 days, going on 10 days. I'm well aware periods can change so didn't think much of it,  and just kept track of it. I saw a GP to even make sure and confirm that everything was fine and they didn't seem that bothered. My last period was in the beginning of October, I've not had one since. Over the past week, I've taken two ovulation tests and they have come out positive, I've also taken a pregnancy test and that has come back as negative. Past two days I've had sharp pains.  I've also had really bad break out across my chest, which used to be an indicator that I was due, but that is clearing up now and still no sign of period. 

I've phoned my GP, but just seem to get shrugged off. I feel like I don't get listened too. Has anyone else experienced this?