Hi,
Thanks for posting in HCM.
I have gone through your description and understand your concern.
There is a remote possibility of becoming pregnant after having anal intercourse. The probability is extremely low, but because the vaginal opening and the anus are very close together, there is the chance that sperm could leak into the vagina and travel to fertilize an egg.
Since you have wiped it with napkins and if the clothing was completely saturated with semen and was in direct contact with vagina, there is a very slight chance the sperm could enter the vagina, but this is highly unlikely.
Hence, if there is no leakage of sufficient quantity of semen into vaginal canal, the chances of
pregnancy is unlikely.
Relax and wait for your periods to come, which states that you are not pregnant. But, from next time, take adequate precautions while indulging in such acts as there could be chances of contacting sexually transmitted diseases (STDs).
Hope the information provided would be helpful.
All the best.