In February 2012 when i was 17 i found i was pregnant i had all the scans done heartbeat taken and measurements and everything was fine until i got to 23 weeks and it all went downhill from there me and boyfriend got told that our little girl was very poorly and had a severe heart problem and after a amnio got told she had Trisomy 21 and she wasn't likely to survive birth so me and my partner made the heartbreaking decision to terminate her i had to give birth and go through all the bodily changes but had no baby, me and boyfriend are not trying for another baby but are not taking any precautions because of what happened and its been 8 months and we still haven't got pregnant im worried i cant have any more children my periods are usually like clockwork and this month im 3 days late so have done two tests both negative what could it be im worrying after what iv been through ?