Freaking tf out....

well my husband and I are in the process of separating and divorcing. He thinks that I have been cheating on him and I most definitely have not been. the last time we had sex was like July 23rd. well I haven't had a period since then and I'm freaking the fuck out. I have taken 2 pregnancy tests and both were negative. can stress have that big of an impact on my period or am I more than likely pregnant?!?! I will probably literally die if I'm pregnant because he will probably think it's someone else's and it will just make my life an even bigger shit show than it already is.