Weird period...

So my period was due yesterday. Since Monday, I’ve had light bleeding. It’s started off as brown then more pink/bright red. Today, it’s been red. Still not as heavy as my usual periods. There are small clots, but’s it’s still light. I’m just concerned about pregnancy since this period seems to be lighter than usual. I’m not sure if it’s just takin longer to get heavy or not.

Also, I started taking iron pills last month. Could this also be affecting my period?