Is this a normal blood clot after birth?

Mom of Boys • Mom of boys ages 9 and 4. Third baby boy born Jan 2nd 2018 💕

I’m 5 days PP and for the last few days I was experiencing pain in my lower left pelvic area and when I would touch it felt like there was a round hard ball there. I figured it was normal. Everytime I fed my baby (I’m breastfeeding) I could feel it and it would hurt a bit. Well today I went to use the bathroom and saw a blood clot on the pad. It’s the size of a golf ball. No bad smell or anything. Just a round clot of blood. The pain I was having is also gone and I don’t feel that round hard ball in my left pelvic area anymore so I figure it was that. It scared me and I looked up that it should be okay but to tell my OBGYN. Is that right? Thanks! ... I would post a picture of it but I don’t think you all want to see that lol