me4ever, it's the 100mg aspirin the FSs tell you to use - all 3 of my FSs have instructed me to take that dose. In America, they usually use "baby" aspirin (80mg). Thing is, it's a NSAID, so you don't want to be taking full doses while TTC unless your Dr has instructed you to do so. It's also category C for pregnancy, so I'd recommend you speak to your FS's office about it and you should definitely tell your OB when you start seeing them. I started low dose aspirin after EPU for my last IVF cycle and continued until 36 wks, but that was a joint decision between my FS and OB, not my decision, and it was done under medical supervision (including extra blood tests to monitor its effects).
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