Annoying late period

So I had sex a couple weeks ago for the first time (protected, condom water test showed condom was intact, he didn't cum etc) and again this past weekend, did everything safe like the first time. However part of last week and most of this week I was sick, and stressed from school over the past 2 weeks. My period was supposed to come the 9th but it didn't. I took a test yesterday just to ease my mind and it came out negative. Could this just be new hormones from only recently starting to have sex combined with my stress and sickness that's making me late? I can't stop thinking about it lol. I always start lightly cramping a few days before my period and the night before I get it I have a big headache. Glow updated saying my period should start tomorrow but I just feel like it's not going to because of the stress I'm giving myself 😣 ugh I just want AF to get here already!