Late period

So this year is already starting off a little rocky for me. Last month I found out my boyfriend had been cheating on me for 9 months. We broke up a week after I found out because he still loved her, so I was looking for comfort. The day after we broke up I ended up hooking up with one of his friends who I also considered my friend as well. (Keep in mind I am on the depo shot for birth control). He made me take plan b and it messed up my cycle a little bit but I’m not sure how different it’s suppose to be since I took it the day after I ovulated. A week or two after I hooked up with him I slept with another friend after he told me he would always be here for me. Then on New Years I was hanging out with both of them, slept with both of them but they both used protection that day. I was suppose to get my period 4 days ago and I have yet to get it... am I just being paranoid? Is this because of the plan b pill? Could I still be pregnant while on birth control and after taking the pill? Please no judgment. I’ve been going through a lot lately and I just feel empty inside.