When did you start wearing maternity clothes

This is my 5th pregnancy and I have 3 children. I am 11 weeks along and am already showing. It is for sure not bloat!  I have been doing the elastic trick on my pants but it's just not cutting it. When did you all start wearing maternity clothes?  With my previous pregnancies it was 16+ weeks so I'm feeling a little like a whale and that I shouldn't be showing yet. I still am 10 pounds under my prepregnancy weight but have a belly!  I guess I'm just feeling like I shouldn't even be thinking about maternity clothes yet. Thanks!