Advice ❤️ maybe baby?

So I’m currently in the hospital with my best friend and can’t leave, I have now officially missed my entire period. I’ve been having mild on and off cramps, sore nipples, and tmi but really gassy. I haven’t had any other symptoms really but I’m wondering when I should test? We have tried for so long and I just don’t wanna give my hopes up. It’s not like me to miss my entire period though, maybe just a day or two. What was your earliest sign of pregnancy? And what’s other reasons I could miss my entire period?