Can opk detect early pregnancy?

I had bleeding 4 days before my period was due, which was a lot lighter than I normally get. It also ended the day my period should of actually started. I am now experiencing nausea quite often and I do not have any pregnancy tests to be able to take one. However, I did take an opk and the below result shown. Has anyone else experienced a similar situation and used an opk to detect early pregnancy? Or could this be the start of ovulation. I am so confused 🙈