I just replaced my battery and when I went to start it, there was nothing then when I did it again it started

Make sure the battery cables are tight. Sounds like they may be loose if it didn't have any power at all and then all of a sudden it started up. Past that the car will need to be inspected by a tech. If you don't work on your own car then use this link to find a good shop near you. https://repairpal.com/repair-shops Alex

As long as it keeps cranking then starting ok - no worries!