What causes weakly positive pregnancy test?
Patient: i was diagnosed as weekly positive for pregnancy earlier this month.however when my beta hcg was tested it was very low.first time it was 63 miu/ ml  and the second time it went down to 22miu/ ml  when i went for an ultrasound the doctor said that he could see an intra uterine gestation sac.i am really confused as to to what is happening because my gynaecologist said that nothing is visible on an ultrasound until the beta hcg reaches above 1000.also my tsh was 7.92. my home pregnancy test was negetive today.my lmp was 9 april and i was spotting from 23 april to 18 may .please help Doctor: Hi,  Thanks for the query. I understand your concern.    Weakly +ve pregnancy test with decending values of beta hcg levels &continuous spotting for about 21days sstill usg showing a gestational sac. indicates  a blighted ovum missed abortion.     As the hcg level is decreasing.. it's clear that pregnancy is not viable &you should go for evacuation of uterus to remove whatever remnents are still inside &is causing bleeding&weakness.    Thanks.