i agree with Nelle on the advice side

i did just want to say - maybe, given it's male factor issues, you DH may feel he needs another outlet to discuss the IVF. being the person in the relationship with the problem that leads to needing assisted conception can be really hard - even with the most understanding partner, it can still feel like you're at "fault" and you need to have an outlet that isn't yout partner. it may be that he is close enough to his mum that she is the outlet that he needs. yes, it's hard that things won't be a surprise, but going through this journey, you need your support networks and if your DH needs that support from his mum...