I’m wondering if I should go in to L&D

Little back story I have a history of preterm birth and this is the longest I’ve held out I’m almost 35 weeks. I woke up this morning hurting very badly in my back and now have to keep going number 2 and am very nauseous!! Anytime I stand I feel lightheaded and not the best. I haven’t lost my plug so I don’t think I’m in active labor. I have a history of pre eclampsia and low iron so I’m thinking my iron might be so low cause this is how I felt. Im not sure what’s going on.