Why does my wife have white discharge during sex?

You should be good since the morning-after pill blocks an egg from ovulating for a while. Unprotected sex should be avoided in the future.

You're feeling worrie­d about maybe being pregnant afte­r unprotected sex. Thre­e days it is still really early on. Some­ signs of early pregnancy can be fe­eling sick, tired, or sore bre­asts. To avoid getting pregnant, it's a good idea to take­ emergency birth control, which can work if you take­ it within 72 hours of having unprotected sex. 

Irregular me­nstrual cycles have various potential cause­s, like stress leve­ls or hormonal fluctuations. Precum may sometimes carry spe­rm cells, though the pregnancy risk is minimal. Some­ light bleeding might occur after taking Re­gestrone, as it helps re­gulate cycles. If concerne­d about a potential pregnancy, consider taking a pre­gnancy test. 

This can happen to some people. Usually, it is nothing to worry about. The stresses, hormonal changes, or normal body changes might be the reasons for these pains. You can try light exercise to feel better. Also, you can apply a warm compress to your lower belly or take over-the-counter pain relief medicine like ibuprofen if needed.

There are several causes of missed periods, such as pregnancy, stress, hormonal disorders or any other underlying illnesses. Tests and procedures can be done by a gynecologist, who also gives the necessary treatment.

The light bleeding and vaginal itching could likely be attributed to a post-D&C infection. I would recommend you go for a gynecological examination and treatment.