Had a csection with tubal 2 weeks ago, my 3rd csection. I started blessing heavy also aches in my back on each side and lower abdomen, shortness breath, is this normal?

No, not normal. With your heavy bleeding and shortness of breath, you need to be seen to insure you have not become anemic. Call your OB and get a checkup done. If the SOB becomes worse today then go to the ER.