irrational sex fear

So me and my husband have been ttc for a year an a half we are a very sexual active couple but during my ttw I struggle because I want to have sex but I scared to anything that will stop or negatively affect implantation and since you dont know when that moment is and it can be anywhere from day 6 to 12 in scared we will unknowingly have sex in the worng moment and affect something and never know. I know this is crazy but I can help but think it advice please