A little bit confused

Al

So I am on CD 8 today. My usual period is 5 days. 1-2 days heavy flow, day 3 medium, days 4-5 spotting.

But this cycle I only had light flow 1st day, 2nd day medium and 3rd day spotting then i’m done. Now I’m feeling light cramps out of nowhere and watery discharge. Should I do the LH test as early as now or wait until CD 10??

Sorry I’m kind of new to LH testing so it would be nice to get insights.