The housework can wait (I say this though, because I only ever do the bare minimum and have a cleaner in once a fortnight to do floors and bathroom).
I got a nasty chest infection earlier in the year (when about 18 weeks pregnant) and was on ABs. The only way I kicked it was to have my mum look after DS1 for 2 days whilst I just lay on the couch and mostly slept. It wasn't til I got better I realised how unwell I'd been and had been trying to keep doing all the usual things - work, looking after toddler, keeping the house going etc.
You need to take a break so you can get better.