How do I know if it is an Implantation Bleeding or Mensuration?

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."

Being slightly late­ for your period isn't abnormal, especially during stre­ssful times or bodily adjustments. The unprote­cted sexual encounte­r on February 7th, followed by taking eme­rgency contraception, could impact your cycle. That might e­xplain your delayed period. Re­member, stress, die­t modifications, and illness can also affect menstruation. If you're­ still worried, a home pregnancy te­st can offer clarity. 

It is essential to note that unprotected sex could cause unwanted pregnancy and there arise the possibility of getting sexually transmitted infections. The change in menstrual cycle might be a result of hormonal imbalance, which in this case should be evaluated and treated by a gynecologist. A gynaecologist should be consulted for a thorough examination of the issue and a range of suitable contraceptive methods should be discussed.
 

PREGNANCY TESTS can detect pregnancy hormones 2 weeks after conception. It's unlikely to detect pregnancy within 2 days post-sex!!! A wait of at least 1 week after missed period ideal... Using test kits too early may give false negative results. CONSULT a doctor if pregnancy suspected for accurate testing.

Having some variation in cycle length from month to month is pretty normal, and it's also normal for cycles to range between 21 to 35 days. In your case having cycle lengths of 23 days and 28 days is within the normal range.. And pain and cramps during a 28-day cycle is quite normal which almost all women go through. If its really unbearable you can condult your doctor