What is your PCT? If it's a SERM, you may NOT feel loss of strength or libido because the HPTa upregulation is so efficient. I've ran SERM solo for PCT and had no issues.
Some people with OTC PCT's report loss of strength and libido around week 3. That is usually the toughest time for PCT regardless of what your protocol is. And if you anticipate loss of strength/libido, why wait until week 3 to start a natty test booster? I'd start it right away and get your free test flowing.