sleeping position

based on my research, best sleeping position daw pag s left side matulog, noong 1st trimester q po left side aq always nkaka tulog, ngayong 14 weeks n q, nag iba bigla, kahit gusto q matulog sa left side talagang hirap, parang d aq comfortable, kaya usually s right side aq, ok lg kaya yun? may haka2 p n kapag right side daw natutulog baka babae daw ang baby namin, i don't know d true o superstitious belief lg.