Bloodtests

It's my second pregnancy but first I have carried that far. I'm 15w2d and did some bloodtests few weeks ago. They found some antibodies in my blood. Last time I had a misscarriage and same results, that I have antibodies in blood test and they redid the test and it was the same. Last time they told me that I had rhesus conflict which cannot happen because I'm 0 rH+ my partner is A rH- but he has some positive antibodies . Doctors were also amazed of the situation...anyway, can it be that my child has the same blood so that is why I have antibodies in my blood tests now? My blood has been clear and perfect so far. Have to redo the tests next week...worried about the baby and what If my body treats it like it is a parasite and starts rejecting it again?

If anyone knows , what the antibodies in blood mean, let me know! Or if anyone has had similar experience.