Apologies I had never heard of that kind of aspirin over here. I do know that in some circumstances aspirin is prescribed to women who seem to have recurrent miscarriages, but even then it's a specific problem and not the rule over here, and clearly the benefits are worth the possible risks.
I think the best thing for a pregnant crew is to be grounded as soon as she finds out she's pregnant. As I said here on a previous discussion (about 2 weeks ago I think?) I too had a miscarriage in 2005 while I kept flying, in my opinion I wasn't doing anything harmful as I was feeling great, but now I cannot be certain that flying (and the hard schedule, although flying shorthaul at that time) did not have anything to do with it.
So this time I grounded myself immediately, as I said BA knew it before my mother and the rest of my family!!!