i think its very normal to have this when your in your first trimester. iam 3wks almost 4wks and my bf mom had her period on the 11th and i had experience some spotting. the computer said that it is normal about 20% of women go through it when in there first trimester. i would take a load off on everyday things that you do. thats what my doctor told me to do. i mean your placenta might be continue to form, sex, excercise, might be the cause of it but it is normal. tell your husband to quit freaking out. you can go to e pregancy.com to read on it. i hope everything works out. goodluck