Stressed

So this is my first time posting anything. I need advice. Yes, I’m trying to conceive but I’ve been extremely stressed lately. My uncle passed away Thursday last week than my friend passed away on Sunday. My fiancé and I have a place with his cousin and cousins girl and we’ve had arguments 2 times within a 1 week time. One of them was a day after my uncle passed away. My depression has been getting the best of me. My period has been so off it’s worrying me. Can stress change your cycle? If so could I do anything to get back on track and stay on track?