Fasting in the TTW

This topic is for any fellow Muslims out there... First of all Ramadan Kareem, may you have a bless month.  Now, where do you stand on fasting during this TTC process? I'm currently around 4DPO and today will be my first fast iA, I'm just a bit concerned about these long fasts being detrimental in the TWW? I'm not sure if there's been any research on this. Any opinions would welcome xxxx