8DPO, Light headed and feel under the weather!

I usually don't post here anymore because I've been ttcfor almost 2 years with no luck and I'm pretty completely over stressing about it and never bother with symptom checking.... 
but I just wanted to know....
I'm 8dpo today. I felt light headed at dinner last night and today I woke up with a sore throat, achy body and just feel really tired under the weather. I really never get sick. I have a very healthy diet and a strong immune system. I work in child care and never get sick. It's not a symptom of my period (apart from fatigue) . Has anyone else experienced these things before BFN? I would so love a reply! 😊🙏🏼

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