Help!

I’ve been feeling bloated, but not like when I’m about to start my period? My stomach just feels heavier and I forgot to pack my pill when I went on vacation. So I missed my pill for a week. I haven’t taken a pregnancy test because my period is irregular and I’m hoping it’s just late. I’ve been feeling sick, and have back pain (lower back). The only time I feel better is if I eat a snack.