Was spotting brown on and off from last mon but it had stopped by fri, no cramps or pain. Had transvaginal untrasound, from my lmp i should have been 6 weeks and 5days but sonographer said i was only 5weeks and an empty sac.  I have to go back on the 8th sept which will be two weeks later. So scared it may be a blighted ovum 😥 also i dont get how they work your due date from lmp as i was on my period 5 days, then after that u have to ovulate then conception takes place.