I suggest you to see your gynecologist for a proper diagnosis. Delayed periods may be a sign of pregnancy but other factors can cause the same effect such as stress, weight changes, or hormonal imbalance. Getting a medical opinion is crucial

In pregnancy, you may not experience regular periods cycle. It's possible for some individuals to experience bleeding or spotting during early pregnancy, which might be mistaken for a period. This bleeding is often lighter and shorter than a typical period and is known as "implantation bleeding."

You might have hyperprolactinemia. What happens is this condition leads to the body producing too much of a hormone called prolactin, causing lactation and pain during sex. There are several possible causes, including some medicines you could be on; thyroid problems, or even a little tumor in your brain somewhere. I would advise that you see a doctor as soon as possible.

There can still be a chance of pregnancy. While the risk might be lower due to the short duration and no ejaculation, there's no guaranteed safe time for unprotected sex. Take a test to confirm.

If your wife took the emergency contraceptive pill (i-pill) within 24 hours after unprotected sex, the odds of pregnancy are very low. On the other hand, it is necessary to know that emergency contraception is not infallible. To make sure, pay attention to such symptoms as unusual bleeding or missed periods, and if any concerns arise, do a pregnancy test.