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Hello, I'm Dr Manos, M.D., board certified ObGyn. First of all there was no reason not to swim. The uterus is basically shut off from anything going through the cervix. What kind of bleeding were you doing before the polyp was removed? You shouldn't be having this bleeding after having the polyp removed. When is your next appointment with the Gyn? I'm sure they want to follow up on the procedure and go over the pathology report which should be ok. If you don't have an appointment scheduled then they need to see you.
The irregular bleeding may not have been due to the polyp or you were going to bleed now like a period.
I don't believe you should be bleeding so soon after your polyp removal and swimming shouldn't have mattered. Like I said you need to bring up your concern with the doctors that have done the surgery.
A d&c would be appropriate depending on what the endometrial cavity looked like before the procedure
If you had removal of polyp and d&c then you shouldn't have bleeding after the procedure except for some spotting and swimming shouldn't cause an infection
I hope it works out