Baby coming earlier then 40 weeks?

Just wondering if anyone else has experience this and has any opinions etc. I'm a day shy of 30 weeks. The past 3/4 days I've lost alot of my mucus plug (I know it can happen throughout and its normal), my belly has dropped, my son feels insanely low (this is my 3rd and I never felt this with my first or second) so low that for lack of better term he feels like he could just fall right out. I pee constantly due to what I'd imagine is his position (literally at least every 15-20 minutes). My belly has measured big the past month at check ups. I've been having Braxton hicks regardless of relaxing or doing things almost constantly for about a week. My lower back is insanely swollen but my body feels loose other then when trying to pick up my children, bend down in general or roll over at night haha. I have no idea if this is all just normal for being this far along as my past 2 pregnancies I had preeclampsia and was induced early at 34 and 36 weeks and felt completely different then this time around. Any opinions or experiences would be gladly welcomed! Hoping this boy stays baking longer!