Positive test but now bleeding :(

For well over a week now I've had pregnancy symptoms , sore nipples , queezieness , cramps, tiredness and then I started getting slightly brown discharge and thought this may be implantation , I done a test and it came back with a vvvvfl but it was there , literally less than an hour after the test I started bleeding and it's red red like my normal period , but I'm normally quite heavy but this isn't as heavy as I normally am , but I still feel sick and getting the tiredness but cramps have now stopped except for a few slight twinges and my breasts seem to be normal , do you think it was a chemical ? :( or has anyone else experienced period like bleeding but still been pregnant ? I'm going to see the doctor 2moro , hoping for a blood test but not holding out much hope :( xx thank you x