Apparently everything is ok. I am not 8 weeks, but 5, as my boyfriend calculated. We could see the black spot today but it's too small to have a heartbeat. I will be having another ultrasound next week just to be sure it is growing because the midwife said it was not normal to have brown spotting for so long.
Next week it should be double the size. I am so excited and hoping to end the first trimester without any major problems.