so 2 weeks after I ovulated I had what I would call a normal period, I then found out 3 weeks after that period I missed my next one and i'm pregnant. is it normal to bleed or have a period? also I went for a scan and they says i'm measuring 5-6 weeks but the sac is empty so I have to go back in a week for another scan, so i'm thinking thats why I bled?