Thanks for the query.
As you had unprotected intercourse
around the time of ovulation, there is possibility for pregnancy.
Sometimes urine pregnancy test kits can give false positive results.
So you better go for blood test
for pregnancy, which will rule out the possibility.
If the test comes negative, you better consult gynecologist undergo physical examination, test for hemoglobin
, thyroid profile and ultrasound
By this the possibility of infection can be excluded and also the cause for your delayed periods and other symptoms can be identified and treated.