I'm on day 3 as well.
I wouldn't really know what advice to give you expect that you can make it if you really want to and to remind yourself of that. Also, nofap is something you DONT do, instead of something you DO, so if you're actually busy with other not fap related things throughout the day, the urge itself should not come often.
Just keep going and if you really want to win, you will. It's not easy, but it is simpel.