Can I apply pure tea tree oil on my pregnancy related acne/pimple bumps on my neck and chest area?

This one better not wait, please check with your gynae or doctor first before putting anything on your skin during pregnancy, even natural oils like tea tree. Better safe than sorry when you're pregnant. That said, if you're looking for something pregnancy-safe for the bumps and itchiness, Mama's Choice Face products are made specifically to be safe during pregnancy and they work really well for pregnancy acne and irritated skin. But do get the green light from your doctor first on what's okay for your skin right now.