Women in this country have termination choices from very early on in pregnancy right up to 22-24 weeks. They can also opt to terminate for serious medical reasons after this point. This is more than enough time to process the pregnancy, and think about how they wish to proceed.
I imagine it is rare to discover you are pregnant after the final termination point and also want to abort. But in any event women absolutely should not be allowed to terminate after 24, 25, 30+ weeks just because they've changed their mind or not considered pregnancy as a possibility.
Imagine the trauma that medical staff would have to deal with if expected to deliver fully formed and healthy foetuses and would be viable babies that have been aborted for no good reason?
Everyone knows that sex = possible pregnancy. We all need to take responsibility for our own bodies and be aware that pregnancy is a possibility after sex and to deal with this asap if there is any chance. There is absolutely no need to be trying for a termination at such a late stage.
This is not about pro choice. We have choices.