Am I pregnant or more of a health concern?

The first day of my period was July 31st. I had intercourse August 20th, I got my period Aug 25th, 5 days earlier than usual. Two weeks later I have been feeling very “off” - lightheaded, urinating a lot more, breasts seem to be achy, exhausted and moody. Today, I have been spotting very light blood with a... show more The first day of my period was July 31st. I had intercourse August 20th, I got my period Aug 25th, 5 days earlier than usual. Two weeks later I have been feeling very “off” - lightheaded, urinating a lot more, breasts seem to be achy, exhausted and moody. Today, I have been spotting very light blood with a twitching pain in my left ovary. It started at 11:30 but then it stopped 5 hours later. I took a pregnancy test half hour ago but it’s negative and I would think if I was pregnant, it would show positive by now if I conceived on Aug 20th. If I’m not pregnant, what could be the other reasons why I’m spotting? It’s not my period.
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