ovulate a week before period


that's right I ovulate exactly a week before my period! me and my partner have been trying for a year now with no help just seeing what happens using the regular ovulation 14days before AF, well this cycle I invested in opk to see if I was ovulating at all......turns out I do but not when I thought it would seem I ovulate a week before AF..... whaaaa?!?! so just wanted to know my chances of actually conceiving now does this effect anything? do I need to see my GP?