Figured itd stop..

So in the first trimester I almost fainted quite a few times. Others worse than others to the point I couldnt see but as long as I sat down I was okay. Well I figured itd stop when everything sorta evens out a little in the second trimester. My doctor knows and said it was normal for some pregnant women. Well its continued. I still almost faint sometimes and I dont understand. I eat all my meals or snack a lot. My blood was tested later than normal but I figured if I had low iron or something wrong they would call me. I dont go back until May 1st and I dont know if I should call and bring it up or not sooner or wait or if its normal