Advice on brothers wedding

Turning to you all for some advice. I’m currently very early in first pregnancy 5 weeks, my brother recently got engaged and last night he said they are planning a service in late February 2022. My due date is Jan 2022. I live in Australia and he is in the UK.

I know it would be too early to do such a big trip with baby, assuming all goes well🙏

He hasn’t locked in the date yet but they found two venues they love with dates in February.

We are close and I do think he would really want me to be there but it’s so early in my pregnancy I don’t know if I should say anything but if I don’t in 6 weeks time the deposit will be paid and date and venue locked in. I don’t expect him to change plans for me at all but wondering if it’s the right thing to give him a heads up.

Do I call him? Or wait and see what happens?