Sex while pregnant

Is anyone having a hard time feeling comfturble while sex !?! I can't have sex without it hurting me , what could it be ? I wanna enjoy it but can't . I don't really know what it is . When hubby puts it in it hurts so much I tell him it's not there and he claims it is ! It does go in but it hurts , it's very rare for him to just place it in and for me to feel good . . I know there's only one hole & thats where it goes in but I just make him take it in and out until It feels right ... what could it be ? Please help , I'm currently 26 weeks pregnant before pregnacy it was never like this.