Find out where your local 'Gemeinschaftzentrum' is - it's the community centre. Check it out and don't be shy - you will find plenty of (swiss) people do speak english....
See if you can afford a travel pass - so you can just 'go out' when he's at uni and do stuff...even if it's just to ride the train/bus/tram and explore.
I did months of window shopping when I first arrived... I would literally go into every single shop and smile and check out what they had on offer...
Find out where your local library is (bibliothek), swimming centre, churches, community spaces...
Life is going to change...a lot....very soon...more than you imagined. You need some other mums to hang around with...and fast...if you are not averse to church then I'd suggest making contact because they are a great source of women! or try some other religious group that suits your interests...
Being cranky also is normal throughout pregnancy, but particularly in the final stages. Do you have family coming to visit you after the baby is born ? That will take an enormous amount of your time...
I'd also highly recommend finding a supportive internet community that's just for mums... there are lots out there but choose wisely.
See if your husband can also network you with some other student's wives - I'm sure you're not the only one in this situation - you might even find some older wives with kids at school or whatever who have time to give you a bit of 'been there done that' advice.
If you want some specific encouragement, feel free to send me a PM. I was your age when I had my eldest. She's 12 now! But when I go around with my 4 year old everyone assumes he must be my 'first' child...it was pretty isolating to have baby so 'young' - my peer group are all raising babies now, and I'm going to be raising a teenager next year!