Pregnancy third trimester - feeling worried

[Wisdomwolf]

All of a sudden, after reaching third trimester, I am feeling quite worried and anxious about near future. I already have a 2 yo DS who's an active toddler. I am expecting DD in Sep. Today I am feeling particularly worried about the future when baby is here about how will I manage. DH helps with looking after DS. We both work from home and I will be taking 12 months maternity leave.
My fil is coming from overseas to help us with looking after DC for couple of months and he'll be staying with us. I am feeling quite anxious about it as well, though he's a nice person but he is from another culture not from UK, from Asia. He wants to help us with childcare for DS when baby is here.
I feel so many changes happening in near future is making me anxious about how my relationship to my son will change, how I will cope with a new baby and fil as a new person in the mix. We really struggled with DS birth as we had no family help and it was just me and DH so I feel some of those memories are coming back and making me emotional. Please give me some advice or perspective, thanks.

You'll be absolutely fine and worries are normal

However what jumps out at me is your father in law tipping up for a few months to stay with you. I think that's your actual issue. Who wants that immediately after birth? And for several months

Could this plan be revisited and an alternative plan sorted out?

He is coming to help look after DS during summer break in his preschool as it's term time only but we asked him to extend his stay so we will have some helping hand for 2 months when baby is here as we did struggle with DS birth and having no help at all.

Also we have no family in the UK so, it's all been just us with no break at all. That nearly broke our relationship as we were constantly burnt out and arguing so we wanted to get some help this time.

We don't have any other family member who can help.