Pregnant 4 months after getting tubes tied 5 months after giving birth to 3rd child!!

Pamela
A couple of days ago I noticed several pregnancy symptoms so I took a test and to my suprise saw a faint line. Took 2 more the next day and deff positive. I called my OB who tied the tubes and he acted like i was crazy when we went in said his urine test was negative and asked if i still wanted blood done. I said of course! So got the results today just missed my period yesterday so it is early but hcg was 33. He said thats low but I am pregnant and maybe ill get lucky and misscarry or it will be in the tube and he can go in and remove both tubes. Even offered the abortion shot w out knowing where the baby is! I said it wasnt planned but if the baby is in the uterus we are keeping him! Idk how to feel. Im scared the low # does mean tubal or misscarriage which breaks my heart. I go back monday to check hcg again. Has anyone had this happen? Low hcg w a healthy pregnancy or tubal bands then get pregnant and it not be tubal? I just need prayers and support the waiting game is so hard...