Signs??

What are some super early signs you’ve had that you were pregnant? I should get my period this weekend; but I just have this feeling. I’ve been extra tired, my Fitbit is reading continuously increasing higher resting heart rate (which I specifically remember from last time), I’m super gassy, and my boobs are EXTRA sore. I’m willing to drop the last one since I’m breastfeeding, but still. Am I getting myself excited for nothing? We had sex once, on the day my apps claimed I was most fertile. We’re not full fledged trying yet, but also not avoiding. Our first was conceived in one shot with perfect timing. Seems so unlikely, is it all just in my head? Making myself wait to take a legit test so if it’s positive I can be certain, and I won’t be disappointed but an early negative and be tempted to test again!!