IV meds for pain relief during labour

AB • IVF journey for #1 (got my +ve on 1.Dec.2018; Baby girl arrived on 1.Aug.2019)

Hi lafies! I'm FTM n currently around 37 weeks, I was thinking of opting IV meds for pain relief during labour as I'm not into epidural unless medically required and I'm not sure about the effectiveness of inhaled pain meds.

My preferred choice is natural but I tend to overthink about pain n stress myself unnecessarily so I want a back up plan which will help me be more calm.

Please share your thoughts and experience.