What Causes Mild Back And Abdominal Pain?

Hi, i m wondering if you can help me as i cannot seek advice from my family GP. I had a miscarriage in Sept 09 (according to my research i was 17 weeks pregnant), i did not realise this at the time as it was my first pregnancy with me having no knowledge about the pregnancy symptoms. However, now i am extremely worried that i have got some kind of a disease or infection as I did not seek any medical attention at the time. I have tried to concieve since the miscarriage occured and have been unsuccessful everytime. i am now currently suffering from bloated abdominal which at times makes me look as though i am 4 months pregnant, mild back pains accompanied by mild lower abdominal pains, i also have the linea nigra which whilst i was prgnant was visible all the way to the top of my abdomen but now has a faint line just to the below of my belly button. I am extremely scared as i know for a fact that i am not pregnant. Please could you help me? Kind regards Miss A Mohamed