Good morning. First congrats. Happy to hear two uneventful pregnancies. The pain u are suffering is due to the fetus that isputting a lot of strain to ur low back. U feel this pain walking straight and relieved stooping forward. When ever u have pain try to lie down supine on a flat surface and do exercies to ur back. This is not related to ur previous pregnancies.
but common in multiple pregnancies. This relieves by itself. When u have severe pain
u can take paracetamol
tab 500mg. Thank u