spd pelvic girdle pain or dislocated back??

let me start off by saying my pregnancy 5 months ago was horrible. i had to get out of work due to my hips being loose or something. i couldnt move or walk with out being in pain legs would go numb etc. well i am 8 weeks as of tomorrow and a week ago i was putting pants on and BAM! i couldnt walk sit move or anything without being in pain. the transition between the two was horrible. took me 40 minuted to use the bathroom that was 2 feet away from my bed. put it this was there was a spider on my door and i could not for the life of me get up in time to go kill it. it dissappeared....anyways i couldnt lift my legs without my lower back killing me..( oh yeah the pain is in my lowerr back by my butt) its like tension and when i move or walk i get a sharp stabbing pain in my spine stops my legs from working and i freeze cant move. im wondering if i could be experiancing this again this early due to relaxin being produced while pregnant and loosening your joints. my doctor is sending me to physical theropy already. this is my 4th pregnancy please hope i dont get put on bedrest this pregnancy. :(