Does implantation blood have a funny smell?

Well I am 90% sure that I am pregnant because I have gotten my implantation bleed today but I'm just not sure weather it's normal to have a funny smell (it's different to the normal metallic period smell). So I just wanted to know if anyone else has had the same thing? I have read on a few different sites that it is normal to have the bad smell because it is old blood (so no period) but just wanted to check I wasn't the only one. Thanks x