I'm 17wks pregnanct & I'm constantly tired even after sleeping 8hours through the night. Low energy, tired. My first pregnancy wasn't like this so just abit concerned. Spoke to my midwife last week who suggested I had a blood test for VitD & VitB but got my results back today & levels are fine. I was also told if I wasn't pregnant I could be a blood doner as my iron levels are good. So if all levels are fine, why am I always tired.... ?