I been trying for a baby and my last period was july 17th and i had sex on the 30th of july and 10th of aug its now the 22nd of aug and no period but i did have spotting on the 17th and 19th for a couple of hours but nothing since then also i have headaches, dizzness and nause after eating plus lower back pain and some cramping in my lower abdomin i taken 3 test all neg could i be testing to early if so how soon should i test or go to a doc to have my blood tested