Help 😢

My amazingly sweet and loving June 18 baby has been at nursery (UK) since August 2021, it was a big step for him as he had been isolated from kids his own age due to covid so struggled to mix and took a while to settle in! He has now started hitting and scratching other kids and I am having to fill in incident reports 2 or 3 times a week, the embarassment and shame I feel is overwhelming! Hes not a bad boy at all and is perfect at home, hes never ever been a hitter until he started there. I have ordered a behaviour chart (simply for nursery incidents nothing else) but anyone any ideas please?! He is so well behaved at home just at nursery these incidents occur!! I am also 7 weeks pregnant and don't need the stress and anxiety of lying awake at night thinking my baby is now a bad boy 😢! Anyone been through similar and help me see a light at end of the tunnel?! Thanks ❤️