Bleeding after sex?

Okay, so let me make this short, I lost my v card back in August to my bf. I'm in my 30s (personal choice) and ever since then, I bleed every time I have sex. Not like red but dark, like period blood. Not a lot. Just enough to stain my panties but it stops after awhile. We dont have sex a lot because we both work different long hours but still.

Last night, my period ended, my bf and I were sexting so I used my toy. I bled after. Idk if this is normal but it makes me upset. Like idk if I wanna have sex anymore cause it totally turns me off. I had a papsmear in September and everything was fine. But its annoying.

Any tips?