Maternity clothes are designed to be adjusted from the moment your normal clothes no longer apply directly to childbirth (and postpartum).
Most women need maternity clothes about 3-4 months but check how their normal clothes fit. If you wear low-waisted trousers, you may be able to hold on longer than someone who saw a higher magnification. Also, be aware that in the second and subsequent pregnancies it is likely to become larger sooner than in your first pregnancy.
“…We can look upon a road from two different points of view. One regards it as dividing us from the object of our desire; in that case we count every step of our journey over it as something attained by force in the face of obstruction.
The other sees it as the road which leads us to our destination; and as such it is part of our goal. It is already the beginning of our attainment, and by journeying over it we can only gain that which in itself it offers to us…”
— “Sadhana – The Realisation of Life” is a breathtaking collection of spiritual discourses given by Rabindranath Tagore