Blood in vaginal fluid

I am a 23 year old virgin. Recently I began masturbating by inserting a finger. I have escalated to using a slim dildo. I have noticed in the past month that after I get really aroused and masturbate, there is bright red blood mixed in my cum. It starts out clear then there is a spot of blood. I have never had any vaginal infections, nothing hurts, burns, itches ect... The only sexual activity I have engaged in with another was oral sex about 5 months ago. My boyfriend and I had a lot of oral sex. He has had sex with other girls in the past though. I am just concerned because I heard that blood could be a sign of HPV and i have also heard that HPV can be contracted during oral sex.

Please let me know if any of that is true and whether or not the blood is cause for concern or if it is just a reaction to a very hard orgasm?

Thanks