Elevated beta hcg in non pregnant.

I had my periods on June 3 2020, and had protected intercourse for first time on June 11. My next period was supposed to be on July 3, but haven't got so took upt came negative and beta hcg on July 6, result was 0.63. Advised by gynecologist to primolut n on July 7 for 5 days,medication stopped on July 11 and got my periods on July 14 but the flow was quite less than usual so took another beta hcg on July 16 (3rd day of period) result was 0.244. Consulted gynecologist and took a scan found cysts on ovaries so suggested krimson 35 and completed 12 tablets. But on July 31 took two beta hcg, one was 2.1 and another was 0.60, which was 50 days after intercourse. My question is am I pregnant and if not why do I get elevation in beta hcg? Is 2.1 miu/ml is positive for pregnant? Please help me