hello...
thanks for trusting the health care magic doctors for ur health related queries.
as u told that u had unprotected sex but ur guy cock doesn't enter completely in ur vagina...right.
for getting pregnant penis should be completely inside the vagina, ejaculation should be inside the vagina and female should be in the fertile period ( that is 10-16 day of period).
as u already told that u had irregular menses and complete penetration of cock happened, so there is very less chance of
pregnancy.
with the above discussion u can try out my suggestions-
1.Relax... Don't worry, there is rare chance of getting pregnant.
2. wait till the next period occurs. if period came then nothing to worry.
3. if period not happen then do urinary pregnancy test. if it comes positive then rush to nearby gynecologist. he/she can help you.
good luck.
free to ask for further queries.
regards- Dr sudha rani panagar