Best advice is to either explain to her what your doing and why, hide it from her, or don't do anything and stay natty. No point in messing yourself up if your not going to be doing things correctly. Rule number one for any cycle is have a test base. And I see so many posts that come up about these crazy side effects people endure because they refused to pin test. I flat out told my girl friend that I plan on being on trt in a few years anyway and with the way it elevates my sex drive and my mood she was worried at first and then really didn't mind. Later she even offered to help me haha.