Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
First of all, anal sex is not likely to cause conception (as sperms cannot reach mature ovum wehen deposited in anus). You suspect that sperm might have entered your partner's vagina and she had taken
i pill on day 4th after sex (which minimises
contraceptive action because the maximum permitted gap between sex and taking pills is 72 hours).
But again, being
PCOD patient when ovulation is hampered, the chances of ovulation can not be certain. In short, if you had vaginal sex in ovulation time, your partner has all the chances of conception.
In such a case, your partner should wait for her period (which will be late by about 8 days due to pills). In case, her next period is delayed by 15 days then she should go for home
pregnancy test.
If it is +ve then she needs to get
MTP done as the i pill is harmful to baby.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Vasudha Jayant Athavale