Mama, please don't wait until bukas, go to your OB or the nearest hospital/birthing center today or tonight, especially with the fever. Back pain + fever at 31 weeks ay hindi dapat i-ignore, and they need to check you and baby properly para sure lang. I know it's scary, pero mas better to be safe, maraming kaibigan ko na nag-rush to the hospital for similar symptoms at naging okay naman sila, pero kailangan talaga ng medical check. Hindi ito time para mag-home remedies lang, mama. Go na now, ha? Let us know you're okay.