Hi,
I understand your concern.
Well, many a times oral contraceptives are given cyclically for 3 months to regulate menses, it is also known to stimulate ovulation.
* So, you being in fertile stage, had an unprotected sex---after regulated cycles --do have chance of conception.It needs to be tested by blood
HCG testing around your expected date of menses.Immediate visit to your doctor, when the test is +ve is needful.
Alternatively it can also be sign of the sore
throat infection you have.
So, please don't take it hard,even if the preg test is -ve this time,continue to try, noting the ovulation by LH test.
Take medical assistance from your doctor.
Pre conseptional
folic acid & Vit. E supplements help healthy concepton.
Thanks.