I am 7 weeks pregnant. i am bleeding(brown - red) when i wipe and cramps! i have been hot/cold but no temp, is something wrong?

Possibly: Bleeding in pregnancy is not "normal" but may not always indicate something is wrong. You need to see your doctor. This can be a sign of an abnormal pregnancy with impending miscarriage or an ectopic(tubal) pregnancy, which can be very dangerous. If you are experiencing significant pain you need to go in immediately though mild cramping can be normal. Hot/cold with out fever can be normal.