Ahhhhh! Job offer confusion

[loulou]

I was browsing our local classifieds when I came across a listing for my DREAM job. I applied on a whim and got called in for an interview. Now I've been called for the final round myself and one other are left Both of us at this point are being offered a job just one would be an assistant.
I don't know what to do! Please help!

Here's my pros/ cons so far...

Pro's
The job is located across the street from my house.
My sister-in-law can care for my son.
I currently have 1 empty space and one coming up end of march, I'm looking to fill
I am very passionate about the work I would be doing.

Con's
I would only be able to give my families 2 weeks notice to my closing.
There would be a slight pay cut initially.
I'm 5 months pregnant and likely won't be able to get EI if I get the job.
In addition to the 2 empty spaces I have one that is about to be filled the week after I'd be starting this job. I'd feel TERRIBLE letting them know.

Ahhhh!!!