Tomatoes and fungus

Hello,

I've two tomato plants in my greenhouse.  I've planted them as I have done for quite a while, using the contents half a grow bag each in large pots.

This year there are small toadstools growing in the pots as well as the tomatoes. The tomatoes plants are in good condition.

I wondered if anyone else has experienced this and does it pose a threat to the plants?

Also, when they bare fruit, is there any any risk of them being contaminated in any way?  As I have a compromised immune system, I don't want to eat anything which might be detrimental to my health.

Best regards,

Mike.