Advice please!!!

So I'm 34w and 1d. Last night my left leg got very stiff and sore along with sciatica pain, this morning it was very swollen and was a purplish/red color and I can barely walk along with pain in lower back that feels like a knife in it and now it's working its way around to my lower left abdomen and very mildly feels like I'm on my period. Was sent to ER for ultra sound of the left leg to rule out a blood clot and thank goodness it was negative but nothing else has been checked, has anyone ever dealt with any of these symptoms before? Getting very concerned and I think I'm gonna take a trip back to the er to rule out early labor... first pregnancy so I'm a little over worried!