thanks for using health care magic.
I have gone through your available history.
Ovulation usually occurs in middle of the regular menstrual cycle. if you are on 27th day after ovulation which mean it is about few days delay in regular menstrual cycle.
if you are having sex at this time, it is less likely to have pregnancy
all your symptoms are suggestive of imminent menstrual bleeding. if it does not,
you should go for Urine Pregnancy test and consult gynecologist