Just spotting

Jessica

So my husband and I have just started TTC. I ovulated the first week of this month. I had an elevated temp all last week. No implantation bleeding and my period was due on the 18th. I had a little spotting on the 18th, yesterday and today. Not even enough for a light day tampon. My period is usually very heavy day 2 and 3. Is this too late to be implantation bleeding? Or am I just having a super light period?