It is very likely the 2 are not related in the least. Had you torn something there would be blood and pain. Secondly even if you had not washed the potato there is alot more bacteria in your colon/rectum that are more than capable of overwhelming whatever bacteria were on the potato. Thirdly the bloating you were experiencein was would have been in your intestines thus the smell and more indicitive of either the flu or more likley a mild case of food poisoning. Had the bloating occured in your vagina I would be more worried however a women natural ph is also not conducive to bactrial growth. Should you go to the doctor is up to you and if there is blood or pus or pain now I would be inclined to go however I think you have been the victim of random coincidence and this has nothing to do with inserting a potato.