Is it just me or is that odd

Is it odd that when my hubby's mom is near I lose my period for my months but the day she leaves for the weekend I get my period and this happened back in May when I had my last one . I'm getting the feeling that for me and my hubby to conceive is to be away from her cause his brothers girl n him had the same problem and once they had sex away from her they got pregnant I been to the doctor were both good to go so why is this happening btw this will be baby #2. 1st one is 5 now.