Sarah, you sound like such a caring person & life is tough at the moment. As your mum is renting a room i assume there is some funds to either put her in a hospice or pay for a carer to come in & give you some rest. Can social services help? My boyfriend is nursing his father as he dies from agressive thyroid cancer & he worries he isnt doing enough; hes an only son. You and your pregnancy must b the priority. Your not superhuman, please allow yourself to be happy & content with your decision that you need a break and ask for help. If no help is available; please try not to worry; you have managed so far & worry just takes away joy which is what you will no doubt b feeling about your pregnancy. Keep strong