Could This Tubal Pregnancy Having Spotting After A Day Of Bleeding And Clots And Had Tubal Ligation Via Clamps Few Years Back?

I have been having pregnancy symptoms, for about the last 2-3 weeks. I started with very light spotting last week for mon, tues, and wed morning. I helped load a very heavy bunk bed wed afternoon and that evening I was bleeding more and my back hurt. I passed several clots Thursday and was bleeding a bit Friday till I laid down and spent the rest of the weekend on the couch, I would only lightly spot when I would get up do use the rest room and my back/hip hurts when I am not laying down. I went to the doctor and told them this and they said t could be a anovulatory cycle, and my body is trying to rid itself. I had a tubal ligation via clamps about 4 years ago immediately following my C-section. the doctor told me to use ibuprofen for the pain. but didn t address why I would only be spoting after one day of bleeding and clots when my normal cycle is heavy and last 7-8 days???? I am concerned that it is possible for a tubal pregnancy??