Hi ladies anyone in my situation?

Hi so I've been ttc a year since my mc and went to docs yesterday I was told I need a blood test at 3-5 days and 23-25 days from day one of my period.... Has anyone had these tests and what is the process? It's starting to really get me down I feel like my body is letting me down each time AF comes and makes me feel less of a woman I hate this.... Hopefully get some answers though.... Baby dust to all ❤️