Rebecca I don't think that this is something you need to worry about. Platelet counts can vary quite a lot, especially during pregnancy. Are you on any medications, by any chance? For example, heparin can affect this.
It's not very likely that this will affect your birth, and you should not get worried about this. The good thing is that they know about it, so you can be monitored. If they are leaving it for a whole month to be tested again, they can't be that concerned.
Good luck for your scan fruit
north Sorry that you have an extra worry! But they are keeping an eye on you, which is good! I thought that growth plateaus eventually, does it not? Maybe yours started earlier than expected?
mrsD The worry never stops, does it? Wondering at what point I need to start the 'serious' monitoring? I never did it with DS, and I can't see how I can use one of those count-the-kicks apps while I'm at work.
I'm really snowed under this week - DH is away, so I'm having to look after DS by myself, and work is really busy! 26 weeks tomorrow, still struggling with constipation, my upper back is really sore/painful/stiff, and my right hip has started to seize up when I sit still for too long (difficult not to with an office job). But everything else is fine, lots of movements, and DH can feel them now as well 