Bras in pregnancy

Im almost 6 weeks and my breasts are so sore. Ive been wearing compression sports bra's the last few weeks. When i go without a bra my nipples rub on my shirt and leaving me wincing in pain. All of my pre pregnancy bras are too small from the extra swelling. Would nursing bras work for early pregnancy or do i need to wait to see how big my breasts get? Is my sports bra okay or is it too restricting for my growing breasts?