Pregnancy our weird periods?

Hey y’all I have had my period twice this month and they have both been super light and are like 4 days long. I have never had a period like this, I had a baby alimony two years ago and got my period back 1 yr ago and I would skip a month and then get it but now it’s just all over the place. Idk if this could be pregnancy or something else? Let me know what y’all think or some advice! Thank y’all ❤️