Late period after Plan B

So this is probably dumb, but I’m just not sure if I should be worried or not.. I got my period last month from Sept. 5th-11th, then ended up needing to take a Plan B on the 13th (taken within 24 hours of having sex). I ended up getting my period again on Sept. 18th and ending on the 22nd, a full period not just spotting.

I haven’t had my period this month yet, only spotted like 1 day a week ago. I’ve taken Plan B a few times before so I know that it messes with your cycle a bit, but I’ve never had it cause 2 periods in a month or skip a month entirely. Is this normal or should I get a pregnancy test?