No, the Word 'soon' is an adverb (soon, sooner, soonest), a Word that modifies a verb, an adjective, or another adverb.
A pronoun is a Word that takes the place of a noun in a sentence.
Examples:
- We will open soon. (the adverb 'soon' modifies the verb 'will open')
- Our soon opening shop is getting some attention. (modifies the adjective 'opening')
- Our shop will feature some unique items. It is the only boutique in town. (the pronoun 'it' takes the place of the noun 'shop' in the second sentence)