Anxiety of being a new mom 😖

So im 12 weeks pregnant and honestly pregnancy is not my favorite stage hopefully its getting easier. I am a step mom to a 3 year old whom I love and adore. Its been a new stage to me being a parent and I think ive done a great job so far. For some reason I cannot shake my anxiety of this new baby coming. I havent had a lot of new born experience and this is my first “biological” child. I am so terrified ill mess up or hurt the baby I just have anxiety everyday on too many what if questions. I am taking a pregnancy class that kind of helps me catch my bearings on handling newborns but this stress is certainly not helping my pregnancy and I just need help! So many moms say that toddlers are harder and that was a breeze to me! I am just so scared that I wont be a good mom to my new baby.