38 weeks lower back pain, breech baby

Ftm here but looking for someone who has some experience. Baby is breech so I’m so nervous about going into labor and not knowing it and then not getting to the hospital in time. The last couple of days I’ve felt like I’ve had decently uncomfortable Braxton Hicks, but nothing that was time able so I haven’t thought much of it. Same with today, irregular BH (or so I think) throughout the day that make me stop and breath for a minute. Now about 30 minutes ago I sat down and my lower back is hurting. It’s a constant ache and nothing that’s coming and going. It’s also more on my left side but in general my whole lower back is hurting. Is this how labor starts? I haven’t had any back pain this whole pregnancy or really been too uncomfortable at all so it caught me by surprise. Water hasn’t broken as far as I’m aware, and as far as I’m aware I haven’t lost my entire mucous plug but I’ve definitely had an increase in discharge and have been losing chunks the last few days. Does anybody have any experience with this?