Starting a cycle with think lining?


I started my injections monday and when i went in that am for my BL test my lining was still thick. It measured at a 7 and they told me that was borderline for being too thick to start but went ahead with it anyways. Does anyone know much about this? I guess since we took a few months off, and i don’t ovulate on my own, I don’t have enough hormones to make me completely shed my lining during my AF. Any one have a Positive or negative experience with this. I am kinda feeling like this is a waisted cycle and we are just throwing $ down the drain. Any insight would help Thanks.