Could I be already?

Ok so my husband and I are talking about TTC starting in May. However, last week, we got a little “careless” and he didn’t pull out like he normally does. I’m on the pill; HOWEVER, I’ve been late-ish (usually take between 6-6:30 but some days it’s been more 7:30-7:45 because I suck at life 🤦🏻‍♀️) on a few doses and we had the stomach bug a couple of weeks ago where I couldn’t keep much in me, so I’m afraid my pill may not be 100% effective. Now, I am on my placebo pills this week and took the first one Sunday. 99% of the time, I start my period between Monday morning and Monday afternoon. Here we are now sitting at over 24 hours later than normal, and I don’t even have a hint of spotting or anything. I’m bloated and a little crampy, but I had an absolute emotional meltdown while I was working today that came out of nowhere. I know I’m probably being crazy, but I couldn’t possibly be pregnant yet, right? I don’t want to go out and buy tests because my brain tells me that it’s not possible that quick. I’m being crazy, right?! It’s not possible for it to happen that fast is it?