i don't know the history of your last pregnancy, but you sound scared to me, and i'm guessing you need the support of other adults around you, so you can get thru this pregnancy, cos this time you're pregnant with a toddler as well, let alone the pregnancy itself. You sound like you either don't drive, or can't due to illhealth, or maybe your dh will take the family car and you'll be carless for taht period, and i get that, cos without being able to drive places, that takes away alot of independence.

I would let all your friends and relatives know the score (if your dh DOES get the job), so that for those three months, you have
= visits from them (if that's what would make you feel better, e.g people visiting at tea time so you have help when your LO turns into a ferret, help with bath and bed time - whatever is the "hardest" time of the day for you.
= regular playdates with people who have an extra baby car seat to take you and your LO to a park, or come to yours, if no extra car seat.
= either people who can collect your grocery shopping for you, or online grocery shopping if you live somewhere that has that service
= people to take you to, and be with you for your scans, or look after your toddler during the scan
= people to bring you freezable meals

Speak up, let those around you know what you actually need (i have just put random suggestions, only you know exactly what you need).

They may just surprise you, and step up. or not. but at least you will have tried.

Try to get yourself Skye familiar etc, before dh goes, so you have that avenue to keep in touch.

Thinking of being a single mum terrified me too, and now i am one. And we survive. But yes, it is different, being pregnant with a toddler as well. (plus i drive and that makes such a difference to my independence as a single mum).

good luck hon.