After miscarriage

On 11th of September I started bleeding, I was 4weeks pregnant. On 17th Dr confirmed with blood tests that I am having a misscarriage. I never had a full bleed just light bleeding and spotting on and off for 16 days. On the 20th I took an opk and it was positive, I was still spotting on and off. We had unprotected sex day opk was positive, 2 days later I took a pregnancy test and it was negative. Now it is 2 days the spotting has stopped completely and my boob hurt, I am constantly tired, frequently urinate and get dizzy and nausea spells. Could this be my progesterone and hcg coming down or could I be pregnant again?