Regarding Pregnancy. Two reports here.

I am into my 8th week of pregnancy. My first torch report had rubella (igm) positive. This test was conducted in Mumbai in some unrecognised Lab. Later I shifted to hometown Nagpur and done the rubella test again. Second report showed by rubella igg positive and rubella igm negative. To reconfirm we did the third rubella test and found both igm and igg negative. First and second test time gap was 3 / 4 days and 3rd report came just after 3/4 days after 2nd report. Now doctor is saying that I need not worry but i am still curious to know why igg came positive in 2nd report and negative in 3rd report. In addition to this, I am going through little spotting and also under medication for the same. I had to go through abortion in my first pregnancy which lasted for 7 months due to cardiac heart arrest. Later also found that the baby brain isn't developed too. Pls suggest if everything okay this time. Attaching my recent two reports here.