Possibly pregnant or just stress screwing with me?

So I had what I thought was a pregnancy scare last month. I was supposed to get my period May 8th, didn’t get it til the 20th. Weird thing about it was it only lasted 3. It usually lasts 6-8 days (EVERY TIME). Took 2 pregnancy tests, both came out negative.

Now a month later?

I haven’t gotten my period (was supposed to be here a couple days ago), I’ve had non stop nausea for the past 6 days (gets bad at night time), actually threw up last night and my hunger is crazzzyyyy!

I know it probably sounds like pregnancy (which it very well could be) but at the same time I feel like it may be all the stress. But I have no idea.