Are any of you mamas-to-be purchasing maternity clothes in your first trimester?

I'm exactly nine weeks today and my poor husband found me in a blubbery mess today because I dug out my summer clothes from last year and I can't button any of them (I even weigh less now than last year). I've also notice that several of my jeans and work pants that I wear regularly are also feeling a little tight even though I haven't gained any weight so far. Is this normal? I was expecting to buy maternity or even larger sizes later in my second trimester, but already?!?! lol. Anyone else having the same struggle?