thank you i know its very unusual but do you think its okay if i only had my bedsheet but i’ve changed it now and not found any needle. this has really reassured me thank you

Yes, I do think that it is okay.

once again thank you so much

Highly unlikely a needle will work its way into a mattress. In the same way you have to push it through fabric, you would have to push it through.

Where you can have trouble is with carpet, because it stands up in the carpet fibers. Same could be true of plush fabric on furniture.

Using a magnet is good advice. One thing I do is keep track of how many needles I've used. Sometimes one will go missing for days, but eventually it will turn up, hopefully not in your foot!

thanks i thankfully dont have a carpet

You could always flip your mattress if it would make you feel better.

I'm a quilter. Here is one of my guild's recent projects Mini Scissors Case with Needle minder

We added a loop so the case could be clipped on a lanyard. The same designer also has Quilted Scissor Holder I also added a loop so the holder can be hung from a hook or clipped to a lanyard. You might also want one of these Flexible Magnetic pickup tool with light . I use this when doing machine quilting. I hang it around my neck.