Do you think I could be pregnant?

So I had a short period from July 26-29th. It was 7 days late, we started having sex again right after and during my fertile window as well. I had a positive opk on the 9th and then had one again this morning. I'm so confused. I've heard opk can pick up on hgc level and cause them to be positive. For 4 days now I have been nauceous, headachy, lightheaded, and exhausted in the afternoon and at night. Did I ovulate earlier in my cycle or do yall think that I am now? My cervical mucus is creamy not egg white.