I think I understand your meaning. You are asking about a kind of 'scrapbooking' for your pregnancy, i think.
I would suggest keeping a pregnancy diary and write down anything that happens to do with being pregnant - first flutter, kick, scan, etc. etc. etc.
Also you could take a profile and face on photo of yourself every week/month to mark your growth.
Possibly think about a video diary too - it is something you and your child can watch in the future together!!