I Had Sex With My Partner On 24 August And

I had sex with my partner on 24 August and had my period on 26 August. It was a regular cycle of 5 days. It's been 2 months after that incident that I had my period again. I consulted a gynaecologist and he asked me to take meprate to regulate my irregular period cycle? Am I pregnant? It's been 2 days after I started taking the tablet. When will I have my period?