Hello,
thanks for using health are magic.
Bleeding during pregnancy is not an uncommon thing.
Most cases of 
threatened abortion during first trimester
are due to 
progesterone insufficiency or due to physical
 stress. However, most cases of threatened abortion 
eventually get to term pregnancies where as in cases of 
chromosomal abnormalities of the developing embryo, the 
threatened abortion eventually progresses to inevitable 
abortion.
You should meet your obstetrician for an evaluation and 
a few test if possible such as progesterone levels, 
urinalysis,
etc. Meanwhile you need strict 
bed rest and also micronized 
progesterone. If progesterone levels could be obtain then the 
drug should be discontinued if levels are good, if not possible 
obtain the levels, then you should take the progesterone 
until 13 weeks of pregnancy.
Hope this helps you.
Dr Achuo