Iron/blood smell?

Okay, so this is weird lol. I'm pregnant, but only just. I ovulated the 14th, and tested positive starting the 25th. Yesterday is when my period was supposed to start, and today I noticed I smell kind of like iron/bloody down below. A few times I've gone to the bathroom and panicked thinking I started, but there is zero blood. Not pink or anything. It's a very faint smell, but enough to worry me I might be losing it or something is wrong?