Can nausea all of a sudden stop?

Am
I'm only 5 ish weeks and all this week everyday I've woken up rough and feeling sick, gone off food everything. 
Today I woke up like my normal self. Ate all my normal foods etc. In fact I'm hungrier than normal. And that horrible taste in my mouth (metallic) like has gone. 
I'm worried my hormone levels have dropped or something 

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