Need advice

Julie • Getting ready to start baby number 2
Hubby and I have been TTC for eleven months now. AF was scheduled to start Sep 30th. I'm usually late. We had sex 8 days prior to my schedule and then 7 days before that. I started spotting on the 30th and my breasts have been tender and nipples super sensitive. Do you think this could be implantation bleeding? 
​I've been getting discouraged, so I wanted to avoid taking another pregnancy test. Any guidance would be greatly appreciated! :)