New pill brand

So I was on a brand consistently for about 8 months then had to switch to a new brand for a month bc they couldn’t fill my normal brand (corona) now I’m back on my new brand and my period is super light. Like not filling a tampon but still constant bleeding through the day. And it’s the “first day” (“started” last night). They didn’t used to be this light when I was on the brand the first time (before I had to do the month of temporary new brand). Normal?