IS IT ME OR MY MOTHER N LAW?

ive been married for 1yr &8 months well throu out this time me and my hubby lived every happy inlove time..well before me my hubby was with another girl for about almost 3yrs no KIDS at all..so whatever things didnt wrk out for them at all.. so she moved far away..i became pregnant and we had a lil fam renion and they brought dae x from far away and honestly i couldnt stand seenin her around..well the next day i misscarried and i tol my mother n law that i was sure it was becouse it REALLY mgot to me!! so she said i over reacted.. till this day they still talk to her and invite her to their house.. my hubby told his family that it really hurt him aswell to see me suffer.. they dont care though well what should i do please my mother n law or stop going around..???