Loewr left side pain after sex!!

Ok so this would be only my second time having sex we used a condom it was painful i dont know if it was the position he was like sitting and i was standing over him with my back facing him...i did bleed more that the first time and like i felt him hitting something inside me then I stopped him....then he fingered me but thats when I noticed the blood ...i dont know if it from the fast thrusting or what i need some advice the pain is only slightly painful on when i move a certain way