Help and advice please!

11 years ago I had a surprise pregnancy which resulted in my now 10 year old. Flashforward to now, my significant other and I are TTC. This will be our second month trying. I finished my period at the beginning of last week. It was seemingly "normal." Nothing out of the ordinary. Just a little lighter than usual towards the end. My ovulation tracker said that I was due to ovulate on Saturday. We did the deed Saturday and then again this morning. A little while after we did it this morning, I went to the bathroom and there was very light spotting. During the day today there was nothing. Then it happened again this evening. Any ideas if this is implantation bleeding? This is all new to me, please help!