I think I’m being paranoid

So I just had my son 7 months ago and my periods have been all over the place. My whole like my periods have been irregular and normally I don’t think much of it. I am currently 3 days late on my period ( I know it sounds a little early) but I’ve been freaking myself out thinking I’m pregnant. My last two pregnancy’s I found out 5 days late. Last month my period came right when it was supposed to. I did use condoms in this last month during my fertile window. I really think I’m just scaring myself. Also I read that things like stress can make your period come late. The only thing I’ve had lately is being tired and some back pain. I just wanted someone to talk to (that isn’t my husband, all he says is I’m over thinking) and maybe an outsiders opinion.

Also I just noticed two periods a month doesn’t seem right either, I’ve never had that happen.