working mummies help

this is my 2nd pregnancy & its SO MUCH HARDER. my first born was a breeze & it makes me feel like a first time mum on my current pregnancy. but anyways, im at week 27 & it has been a drag with the aches, nausea & reflux. my job enables me to actually work from home but it seems so hard to explain to my boss ( male ) that its a drag to commute to the office & back. do hospitals write memos for this?