Pregnancy made my first born super clingy?

Ra

We have an 11 month old and I am currently about 9 weeks pregnant with our second. So this is probably just me over thinking, but right before I got my first positive pregnancy test, she started getting super clingy and extra fussy. Has anyone else had this experience. She is still breast feeding around once or twice a day, so I wondered if it could be some kind of change in my breast milk?