Hi!
I am not sure whether you are near LAKESIDE but they have a T-shirtrpinting shop and you can put what ever you like on it, they have ready made ones already, such as" does my bump look big in this?" etc etc.... Although, I am sure they would have these type of shops dotted around the ountry......
I got some from NEXT clearance store (also at Lakeside retail park), which were nice, saying Pregnant and proud and another one saying "POP" (Pretty Obviously Pregnant) but these ones I will wear when I am a few more weeks on. They were bargains at only a £5 each and everything in the store is brand new!
Good luck!
Sarah x