Hello kittyonthebeam,
I'm sorry to hear about your hair loss. That's very upsetting for you - it's the sort of thing that can be totally consuming, so try to push it out of your mind if you can, otherwise every lost strand gets scrutinised. I know!
I wouldn't bother going to a trichologist, if I were you. Your doctor is likely right - it does sound hormonal.
Given that I was told I was perimenopausal and had done some research, I thought I'd share this with you - I don't know what you're planning to do about HRT or hormone replacement after the pregnancy, or what your needs are - but there's a natural bio-identical hormone doctor in London who is really recommended. Her speciality is women's health and she works with women to create a special (not one size fits all) hormone package; and the hormones are from natural compounds - basically, from what I can summise it's about replacing what your body needs. Here's her link.
www.drmariongluck.com
If you google her, you'll find some good reviews - I know, from another website, a girl who went to her when she was menopausal and she really helped. She also does telephone consultations, which may be good for you if you're abroad. I don't think it's cheap-cheap, but i think the biggest cost is the initial blood tests.
Anyway, I was going to see her when i was recently diagnosed as perimenopausal. But then I got pregnant! So now I'll probably see her when (fingers crossed) the baby is here. But I've noticed a small hair shedding, and I've had shedding over the past two years, so I'm sure the hormone fluctations, at least in early pregnancy, don't always help.
Keep the faith - my sister has far thinner hair than me and she lost a lot for hormone reasons. You could see her scalp. She was prescribed the pill, I think, and iron and lots of other bits and pieces and it's definitely improved.
Good luck and try not to worry, which I know is easier said than done.