Ate, this sounds really uncomfortable and 26 weeks is still early pa, you need to call your OB or go to the hospital na ngayon, hindi bukas, lalo na kung di ka makatulog dahil sa sakit. Placenta previa with pain needs proper checking talaga, kaya please don't wait. A few of us mums have had complications during pregnancy and ang best advice we all got is to listen to our bodies and go straight to the doctor kapag may ganitong symptoms, walang "just rest, baka maayos lang." Stay safe, mommy.