hello..
thanks for trusting the health care magic doctors for ur health related queries.
firstly I want to tell you that delay menses having many causes, one of the most common cause in ur age is
pregnancy, but as u told that it UPT is negative then pregnancy is ruled out.
delay in menses having many causes like endocrinological and pathological causes in the body mainly in ovaries,one of the most common cause of PCOS (
polycystic ovarian syndrome), this causes irregular menses,
acne, obesity and
hormonal imbalance like
insulin resistance etc.
as per ur information ectopic pregnancy can also causes irregular menses, so don't worry, relax.
with above discussion u can try out my suggestions-
1. relax, menses will be regular with time, u can wait.
2. if u r in hurry then visit nearby gynecologist. he/she can help you.
good luck
regards- Dr sudha rani panagar