in you had unprotected intercourse
around the time of ovulation then there is possibility for pregnancy
as previously you had regular periods the time of ovulation can be predicted, so try to correlate that with the days of intercourse,
anyhow just having symptoms will not confirm pregnancy and not having some symptoms cannot rule out also,
so you already crossed more than 2 weeks after expected date, you better go for urine test for pregnancy to detect the possibility,
if test comes negative once consult gynecologist to find out the cause for yiuer delayed periods and to take treatment accordingly.