You did unprotected sex 3-4 wk ago and ejaculation does not takes place. Some times pre cum or prostatic fluid,secreted prior to ejaculation,may cause pregnancy
in lower rate but depends on ovulation time.Levlen
ED is combined low dose OCP,used to prevent unwanted pregnancy with effectiveness more than 99%. Taking 2 pills on next day after missed one pill gives same effectiveness.
Condom has failure rate of 14-15%. It is better to wait 1 wk and if period not comes,do a urine test for hcg to confirm/exclude pregnancy. Hormonal
may delay period.
Be well and practice safe sex.