Late but negative and I did weed.

So ladies I am 6 days late if Af and took a test and negative. This is so odd to me because whenever I am late it sure is because I’m pregnant. So hubby and I just came back from vacation. We’ve been active on our vacation and also did some weed since we were in Colorado. Could that be a factor in my late period? I u see stand I shouldn’t be smoking since we are wanting another baby. I don’t smoke weed or cigs. Since we were on vacation and in a place we’re we could I figured why not? Does weed affect conception or delayed Af?