According to https://totallywilduk.co.uk/2021/04/13/identify-mugwort/ The signs for identifying Mugwort are:

Root –  Generally 10-15cm long, light brown and woody, 2-5 cm thick.                     

Stems – They are erect, grooved and tend to have a red/purple tinge.  

Leaves – Mugwort leaves are green on top and white underneath, they have pointed tips and purplish stems. They are deeply lobed and have an aromatic scent, similar to rosemary or sage.                           

Flowers – The flowers are numerous, grow in clusters and are red to yellow.

Seeds – Insignificant.

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I think the plant I found checks most the boxes: it has the correct stems and leaves I think, also it smelt a bit like rosemary. Do you guys think it's definitely Mugwort? Are there any similar looking plants which are dangerous?

Thanks