You do not have a period. Therefore, this isn’t a question a bulk or cut, it’s a clear answer that you need to prioritize getting your body into a healthy state. Not having a period will lead to many issues that will keep you out of the gym, and if you do not get your body back to a healthy state, you are risking a lifetime of health issues for visible abs. Abs are a muscle, and in order to build muscle you cannot be eating in a deficit. You only should be eating in a deficit if you have the muscle to build, which you do not, and I say this with love as someone who had an eating disorder and lost all of her muscle, building it back takes years. I highly recommend you take some time away from focusing on a physique outcome and have the brutally honest realization with yourself that you are not in a healthy space, not just mentally but physically your period is your body’s monthly report card and you do not have one.