gysela I'm so sorry, and I wonder why your colleagues couldn't carry the boxes of wine?????
I had a ruptured disc/sciatica before pregnancy and 2 surgeons recommended surgery as the only option, which I refused. So I swam 3x weekly and took smaller Pilates classes, and now no pain. All docs thought that a pregnancy would bring this back, but I'm 25 weeks and (knock wood) it's not. However, I do about 25 minutes of Pilates/Yoga combo EVERY morning (in addition to a long weekly pregnancy-focused class) to ensure that my core/pelvic floor muscles are fit.
Don't over-do anything while the pain is bad, but do try some of the yoga postures when it subsides during the day.
If you have access to a pool, try walking in it first, and just moving about, and if feeling better, then do a few laps to start. Or if there is a local pregnancy Pilates class, check with your mw/dr to see whether you can go.
The belt is good for a while, as long as you don't use it for long periods...try to rely less on that than your pelvic floor muscles, which will give you more strength.
Take care and hope this goes away!