Am I pregnant or going crazy?

I had a D&C Oct 28, last Monday which would be almost 2 weeks later I took an ovulation test after hubby and I BD, it was positive and positive again the next day, then following all have been negative. Today I got my HCG levels drawn bc I have been feeling pregnant like I had before. It came back 90. My question is, it can't be left over hormones bc don't your HCG levels have to drop below 5 to ovulate, and why would I just have 2 positive ovulation tests and the rest negative if I wasn't pregnant. I'm re-testing my HCG levels this Thursday 

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