Feels like I took a cement block to the crotch

First time mom here. I’m almost 4 weeks out from my due date and my son has dropped significantly lower into the birth canal. How long after you started feeling that constant pain that’s basically the whole area a pad would cover? If I squeeze my legs together or shift them out too far I can feel my pelvis grinding and popping and all the muscles in that pad area hurt. Half expect him to just start coming out with how close to the exit he feels 😂

I guess what I’m trying to ask is, from experience, those who’ve been in this position, after all this started occurring for you, how much longer did you go before you went into labor? (No inductions or planned births) just normal labor?