Ovulation can vary each cycle and be influenced by a range of factors like stress, travel and medication. Clue Conceive can only predict the day in which ovulation is most likely to happen. There is still a chance that the days after your prediction may be your actual ovulation day, which is why Clue Conceive still shows these as fertile days.
This ensures that you can make the most of all opportunities within your cycle to conceive. Whether or not you feel like still having sex or doing home insemination after your predicted ovulation day is up to you.