Donna, great news that you've had some more reassurance this week. It is scary and changing clinics and ob. support sounds like a really good move.
You asked about 2nd trimester. Overall, I had a relatively easy pg. Lots of queasiness in the first trimester, a few upchuckings but nothing too serious. I bled suddenly for 3 days in the 14th week which took me aback and meant a week off work which was scary as I'd assumed I was out of the main 'risk' area (although I was told there's nothing concrete about 12 weeks being any safer than weeks 10-15, it's just an average that's become a benchmark).
Re. your Q about "you have more energy, less nausea, less worrying, great sex?". Yes, I had a good 2nd trimester after the bleeding scare, certainly plenty of energy and good moods, less nausea, gradually less worry re. m/c - but to be completely honest, it was replaced by waiting to feel the baby move and then, once she did eventually make her presence known (ca.20 weeks), worrying about whether I'd felt movement or not recently. And yes I relaxed sufficiently to enjoy sex again. My greatest bugbear looking back was heartburn which was terrible. Night after night unable to sleep with it. It does also get hard/uncomfortable to sleep later on although I wasn't very big - I shot out at 4m and looked v.pg v.early but then stayed like that for most of the pgy, I got a little bigger just before she was born but how I looked at 4-5m and 8m were pretty similar.
The thing about maternity trousers is they often have handy elastic/expanders in the waist than can be pulled in/let out as you need them. Plus the 'give' is in front vs. all round. Regular but larger clothes won't have the same flexibility.
Debbie, glad to see you're doing well
Alette and Caroline, I hope you're both feeling very well indeed!
Enjoy your pregnancies ladies

I'm looking forward to my next one!
hugs
Debra.