Hmm, okay so normally okay lang ang tihaya, pero as pregnancy progresses, mas recommended ang side-sleeping, lalo na kung third trimester na, nandito kasi na yung weight ng baby at mas okay sa circulation ng dugo. A few of us pregnant mums tried staying on our backs lagi, pero nagsisimula kaming ma-dizzy or ma-shortness of breath, kaya nag-adjust kami to left side sleeping, which is really the best position. Since everyone's pregnancy is different though, better to ask your OB about what's best for your specific situation, especially if may concerns ka na!