Hello
Thanks for posting your query at DoctorSpring.com
The B HCG levels are not doubling as expected.
Also, by 6 weeks, atleast a yolk sac or fetal pole should be seen.
I do not mean to give you false hope, I think a blighted ovum is very much the possibility.
I fail to understand why you are attempting pregnancies so frequently and close together.
After an abortion, there should be a minimum gap of 3 months to let your mind and body heal.
You should take 5 mg per day folic acid supplements meanwhile.
Also with 2 -3 miscarriages now, you need a complete evaluation for the cause of recurrent pregnancy losses.
You need -
1. Couple karyotype
2. Karyotype and biopsy of aborted material.
3. Screening for antiphospholipid antibody syndrome
4. Testing for thyroid levels, blood sugars , infections, homocysteine levels etc.
All the best
Please feel free to discuss further.
Regards.