Help!

This is our first month TTC. I had some spotting 10 days after ovulation. It has continued for about 6 days. It is super light I really don’t need to wear much because it is so light. It is mostly there when I wipe. I am now three days late for my period and the spotting stopped today. What could this be? Should I talk to my doctor? I have been having light cramping, a sore lower back, acne, and very tender breasts. I took a pregnancy test on the day my period was supposed to start. It was negative but I was still spotting.