Uy, mama, this is something you really need to check with your OB right away, hindi dapat i-ignore ang buong araw na tightening, lalo na with the side pain, okay? 36 weeks kana, so better safe than sorry talaga. A few of us moms have been through this too, at ang doctors really prefer na marinig nila agad kung may ganito, kaya please don't wait, call your clinic or go to the hospital if it gets worse or mas masakit. Sending you good thoughts, pero seryoso, professional check lang ang makakapagsiguro sa inyo both.