Inhad a scanning at 5 weeks my docotr said theres...

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Can you  be certain that your pregnancy will go smoothly?

 
yes if there is normal [pelvic ultrasound and normal gestational sac you need to make ultrasound every week in 1st month then every 2 week in 2nd month then every months 

What other oinvestigatin to do ?

1.HCG and see if it's multiply in normal pathway every 48 -72 hours 
2.tetra  test from blood sample alpha pheto protein estradiol E2  p4
3.amnitic fluid sample 
4.chorinic villous sample 

What drugs to take ?

keep going on prescriped drugs metformin folic acid duphaston and for thyroid glands