I've just done a positive test and am about 5 or 6 weeks pregnant for the first time. Hooray! But I'm not sure what to do about buying bras. I am already finding my regular bras a bit tight and would like to buy some more, but I don't want to get some and then find I'm even bigger a few more months down the line. How much bigger will I get? When is it safe to buy a new size bra that will last more than a week? I'm on a budget so don't want to spend my live savings on bras.