I'm confused

I've recently started being sexual with my bf the last month or so and we have used a condom every time (18 and 19). I'm supposed to get my period in about 5 days and I'm super regular

I've noticed the last 2 days that my feet are a little swollen, I've been nauseous this morning, breasts are a little tender, tiredness and mild abdominal pain. I've never experienced this before I'm supposed to get my period so I'm a bit confused and wondering if this is just new cycle symptoms or something else?