OK, if intercourse is hurting you, it is NOT because your husband's penis is too big - your vagina is soon going to expand enough to allow a baby to pass through, so it's not likely to draw the line at a penis, no matter how big it feels or looks.
Basically, you are not 'ready' for him when intercourse starts.
You need LOTS of foreplay, and you need to be very relaxed and lubricated.
Ask him to go very slowly and gently, and guide him about what is comfortable for you. If he heading into you like a battering ram at the doors of a castle, then no wonder it hurts!
Make sure you take charge, and make sure he listens to you.
With some loving guidance, and co-operation, you will be able to enjoy intercourse again - but tell him to take it nice and slow.