My PCOS Diagnosis and Unprotected Sex Experience

Hi guys. I was diagnosed with PCOS in 2011, I have had irregular menstruation since then. However in the past one year my period were within 45 days of gap. Although, I had unprotected sex and decided not to take plan b. I did a home test pregnancy a few times (it was negative), I also went to an urgent care and did a blood test, it showed 3 hcg level which is negative. Although it’s been 3 months since the intercourse and still no period. I have an appointment with my gynecologist coming Wednesday. Have you gone through something similar? I know it was a dumb of me to not take precautions and I regret it. Can sex cause changes in your hormones? I am sure my doctor will be doing an ultrasound.