2 periods in one month after plan b/ttc

I’m trying to conceive . I had a miscarriage earlier this year. Me and my husband decided I should take a plan b because we wanted to wait 3 months in order to be pregnant . I feel like if I would’ve gotten pregnant too soon I would’ve had another miscarriage. I took a plan b and winded up in my period today . My last period was sep 13th so this is my second period . I’m usually regular. Is 2 periods bad for the uterine lining? Is this a real period? I feel this is a dumb question so I want be anonymous