Opinions please!!

I ovulated on 11/7, I got a positive test on 11/16 and it got very dark very fast. On 11/17 my Hcg was 18 and today 11/19 it was 80, I’ve been incredibly nauseous and tired especially considering I’m not even to my expected period yet. What is going on, why did my level OVER QUADRUPLE. I believe I triggered ovulation because I had 24 hours away from my nursing 15 month old, the next day I got all the “ovulation symptoms” on CD 17 of a usually 28 day cycle but way more symptoms than I typically have and I was really crampy on both sides. This will be my 3rd pregnancy and I was never really nauseous with my others.

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