hello sir, I am 25 year old ,and I am willing to do a marriage with my girlfriend , but there is one problem about our marriage is that our blood group (o+ve) and also our nadi is also same(antya) . as per the horoscope our kundli is matching excluding nadi dosh is 22 points but I am just worry about the child birth and after child birth is there any problem will arise .please help me out from this problem thanks

Faith in Horoscope goes with your belief system. Except Hindus no one believes in horoscope matching for marriage and still life is on for them. I have seen numbers of couple with Nadi Dosh having normal healthy kids and without Nadi Dosh having no kids. It has no connection with medical science.
Having a same blood group will not cause any problem.