I need toddler avise

I’ve a very strong headed toddler of 2 years old...I’m currently 13 weeks pregnant with my second and I feel like I can’t discipline her at all. Shouting doesn’t work, telling her off doesn’t work, naughty step/corner doesn’t work, a tap on the hand does nothing either. I’ve really tried the calm approach of telling her what was wrong, ignoring the negative and praise the positive. I know lockdown is probably playing part but she hits and bites gets into places she knows she’s not supposed to.

I’m scared I’m starting to feel detached from her and even the pregnancy...I’m not sure if it’s depression playing part again but I just feel so powerless in the situation. My partner is great support right now but even he’s not sure about what to do about our daughter behaviour.

I know she doesn’t mean to hurt us or get into trouble but I just don’t want her to get hurt or not be able to trust me cause I’ve no clue what I’m doing.

I’m sorry for the long post, I’m just really stuck and I’ve no where else to turn to it feels really.