I think your conservative sikh family will most likely disown you if you tell them. It seems to be the general rule that blacks are considered the worst partners to marry, which is obviously an outdated and bigoted view, however they will be even more abhorred by the fact that you have lost your virginity and his sperm has been inside of you
Now I know that as a sheltered sikh girl you will not have not had as much contact with men as you might have liked, and are hence instantly wanting to marry the first guy you have had sex with/shows you some attention. But I think you should think long term. You are already having problems with this guy, can you see him staying with you if he disagrees with every aspect of religion? Not to mention your child will have no support/contact with family if they disown you and will be outcast by your community. Also if it breaks down now, which relationships often do, then your family will struggle to defend your reputation and marriage proposals may be hard to come by if existent at all. Personally I would ditch the relationship as it seems on shaky ground and pretend it never happened/ don't tell your parents as it will cause more harm than good and for what?