Did a pregnancy test very faint positive then has bleeding and cramps massive back pain and heavy sore chest am i pregnant ?

Likely: If you did the test correctly and it was positive, even if faintly, you are likely to be pregnant. However the bleeding may be your regular period due to loss of an early pregnancy. You should repeat the test in 4-5 days. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex.