I’m not sure what color oscar eggs are supposed to be but that seems odd. Cichlid eggs are usually clear and amber in color. Could be different as some of my discus laid reddish eggs as well. Most eggs hatch in 3-4 days so if it’s been that long, and the eggs are opaque or fuzzy, it could be they’re dead or infertile. There’s a possibility you have two females or it’s just a young pair. They’ll give it another go in a couple weeks or so. Look at their breeding tubes then to try and determine their sex...short and blunt is female and long and thin is male.