Do I have possible symptoms of ovarian cancer or is there something else it could be?

About 9 weeks ago I started to feel nauseous and extremely tired. I have been getting a sharp pain in my left side and have been having abdominal cramps and mid and lower back pain. I thought it was a bug or something and would go away but when it kept up after 2 weeks I took a pregnancy test because I realised the symptoms are similar to pregnancy. I have been having my periods which are very heavy but I took the test anyway and it came back negative. The back pain and abdominal pain comes and goes but the nausea and fatigue are constant. I am also cold most of the time and my abdomen is bloated all the time. I have been diagnosed with ibs years ago but the way I feel now is not like I have ever felt with the ibs before. I have taken another pregnancy test 7 weeks on and another one last week and they came back negative also (I was paranoid but just took them as I didnt want to be smoking or drinking if I was pregnant) . I have noticed a white discharge with slight pink tinge to it . If there is anyone who might be able to shed some light on this Id greatly appreciate it. By the way I have been to the doc and got blood results (all clear) for thyroid diabetes and anaemia. I am going for a smear on thursday.