Regarding song titles - is this a problem?

I know many songs have the exact same title, even when they are a different song completely. I'm a songwriter, and I have a song called 'Mercy Mercy Me'. But I noticed recently that Marvin Gaye also has a song with that exact same title. Bear in mind that my song is my own original, and is completely different to Marvin Gaye's song - only thing that's the same is the title. Should I worry about this? I'm only worrying about this because 'Mercy Mercy Me' is not exactly a generic title, it's one of those titles that wouldn't be very common for a song, so I don't want people thinking that I've 'stolen' the title...