Constantly Lightheaded

I am 11 dpo today. I had slight period like cramps 6 and 7 dpo. Since 9 dpo, I have had a constant headache, been feeling dizzy every once in a while and feeling nauseous on and off. When I eat, it goes away for a few min. but comes right back. I've taken tests but all neg. Did this happen to any of you before your BFP??? if not, what could be wrong?

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