I use baking soda. Baking soda can treat blackheads because of its antiseptic quality. You have to mix baking soda and water until you get a paste-like mixture. It's very important to use it on a regular basis. If this doesn't help you, there is an interesting article on how to eliminate blackheads and get clear, glowing skin at this website.
I totally agree with LarryD517. I practiced Yoga during pregnancy and I didn't encounter any problems. Also,many of my friends also did Yoga during pregnancy. and they also didn't have any problems. However, you should consult your doctor for advice because your doctor is most familiar with your personal situation. Also, you can try to find some pregnancy websites that explain which exercises you should consider when pregnant.