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Will my booster yesterday cause me to show positive if I take an LFT today?
No, LFD's test for active parts of the virus.
The vaccines only contain inactive parts of the virus, but they still trigger your body's immune system into going "oh shit, we better deal with this" which includes symptoms like chills, fever, etc.
Random NHS link: https://www.ouh.nhs.uk/working-for-us/staff/covid-staff-faqs-vaccine.aspx
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Q. I had my vaccine yesterday. I did my lateral flow testing today and it has turned positive. Is this as a result of the vaccine?A. No. The vaccine will not cross-react with the lateral flow device (LFD). Therefore if your LFD is positive it is very likely that you have the COVID-19 infection.
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Will my booster yesterday cause me to show positive if I take an LFT today?
I’ve woken up feeling exactly like I did when I had Covid - way worse than any vaccine has left me.