Oo, pwede naman, mama! Actually, mas importante pa gumamit ng sunblock when pregnant dahil mas sensitive ang skin at mas prone sa melasma. A few of us pregnant moms swear by using sunblock daily para maiwasan ang dark spots, one of my friends didn't, tapos nag-develop siya ng maskara and it took months to fade. Just make sure to pick one na safe for pregnancy, preferably mineral-based or pregnancy-rated brands, at i-reapply every 2 hours lalo na if you're out in the sun. Better double-check with your OB din kung anong specific brand ang okay para sa inyo, just to be extra sure!