i am 1 week late for my period, earlier i had thick brown discharge. i put a tampon in and then a couple of hours later when i went to change there was a bit of red blood on there. i have some signs of pregnancy but i also have a coil in. i also have cramping pains and lower back pain and feel quite sick. i took a pregnancy test 6 days ago, the first one showed a really faint line and the second was neg ! please help.