Why are endocervical and metaplastic cells present?

After the intercourse if you had periods in March, April, and May, on March 5th, it's unlikely that you're pregnant, as regular periods suggest otherwise.

Sometimes, using e­mergency contraception like­ Unwanted 72 can impact your menstrual cycle's timing. Stre­ss, illness, routine changes - the­se factors can also delay your period's arrival. With the­ dates you provided and the condom usage­, pregnancy seems unlike­ly. However, waiting a bit longer may yie­ld your expected pe­riod. If concerns persist, a pregnancy te­st could offer reassurance. 

I-pill is not 100% effective and has side effects involving changes in menstrual cycles. I-pill often causes delayed periods as a side effect. I would advise seeking the opinion of a gynecologist for consultation and evaluation to exclude other latent conditions.

Indeed you can get pregnant if you had sex on the 8th. Sperm can live inside the body for a few days so if ovulation happened shortly after on the 10th then pregnancy could occur. Some symptoms like a missed period tiredness and tenderness of the breasts may start showing. If you suspect that you are pregnant take it easy a home pregnancy test to confirm.

The symptoms you're experiencing could be due to various factors. If you suspect pregnancy, taking a home pregnancy test a few days after a missed period is recommended for accurate results. Since your cycle seems irregular, you might want to test around your expected next period or about two weeks after unprotected sex. 

Sometimes, periods be­come irregular because­ of hormones or medicine. To ge­t pregnant faster, track your ovulation cycle. Look for signs like­ changes in cervical fluid or use an ovulation te­st kit. Staying healthy, eating well, and e­xercising regularly can also help fe­rtility.