hi,i last time i hv periods on 10 aug,this month i hv not,i tested urine n tht was possitive for pregnancyg.i went to the dr ,she did ultr sound n tell md tht after 17 days it should b v clear signs of baby in utress,but there is nothing clearly find out,she sugested me myfol 4 a week,i m v much worried,i hv concieved fter 6 years,help me out plz