Now keeping your natural test levels up during your cycle is incredibly beneficial to your cycle, if you want to be sterile, get a vasectomy. Otherwise i wouldn't use juice as a form of birth control, while it may work, it won't work with any kind of reliable certainty.

Now clomid does act as an antiestrogen, but it does so by competeing for estrogen receptors. You see it has a higher binding affinity for the receptor than the estrogen in your system, it actually is an estrogen like molecule and is a form of estrogen, but it's much weaker than the estrogen in your system. Now it will bind to the site blocking the receptor so the stronger est in your body won't be able to bind. Now of course having a ton of estrogen in your system isn't beneficial to building muscle, but having some is beneficial. You don't want to completely supress estrogen in your system, that will hinder gains. You still have estrogen in your system and it still does bind to some of your cells, but clomid will block a lot of the est in your body.

Clomid eod during all cycle, then i like to use 4 weeks post cycle on most cycle. I generally use longer acting esters as my base to all cycles.

hope that helped