Regarding Covid Test. Virus on day 1?

I travelled for 12 hours yesterday in the Delhi-NCR region. There are guidelines in my city that anyone returning from Delhi-NCR should get themselves tested for Covid-19. However, i was reading that early testing after infection might give a false negative and impression that one is covid negative since virus takes around 4-6 days to show symptoms. However, since morning, i have been having high heart rate (around 110) even while i am resting. Similar thing used to happen to me when my body used to fight other viral infections in the past. So, should i get myself tested for covid as soon as possible or should i wait for 4-6 days so that i can get accurate results whether i am positive or not. Are currently used testing kits able to detect the virus on day 1?