Identification: mushrooms growing in my shop brought compost

cant remember if we repotted with john inns or lidl but I now have creamy white tiny mushrooms growing, can you tell me what they are? and are they poisonous? I think it was defiantly the lidi compost but my other half isn't sure but I swear I used all the john inns on my raspberries lol anyway ill attach 2 pics if u need any more info ask away but never had this happen b4

 

no one recognises them? they r very tiny, turn grey and some go flat b4 they shrivel up and die, are they poisonous?