4 day late, PLEASE HELP ! Worried 😩😩😩

Yesterday I was 4 days late having hot flushes and feeling really yuck in the belly couldn't eat much! 
Today I have brown discharge and aso when I wipe it is pink, 
I've taken 2 hpt and both negitive, Iv got an appointment next week but just a little worried it could be serious, 
Had anybody been through something like this ? 

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