Postpartum tampon pain


My daughter is 7 weeks old now and I got approved at my 6 week postpartum appt to use tampons again. I got my first period since having her a couple days ago and it hurts putting in and taking out the tampons! They’re not hard to put it the plastic applicator slides in fine but it’s the pushing it in and then when I pull it out it hurts a lot. Anyone else experience this and know why and when it will stop?