Pregnant again?

Still have 3 days until my period is due but I started laughing while crying which I’ve never done, I’ve been extra irritable, and i have a 10 month who I still breast feeding a few months ago and was already slowing down before that. My supply started going down but recently it’s increased a little and it’s more clear. My breasts have also been sore. Now I know most of this could technically be PMS but it’s never been thus bad.