Hi am I pregnant and when should I test?

Shelby
Hi everyone well I missed my period, also have been feeling reall nauseous, I been having sever lower back pain,been really tired not normal for me! I have PCOS been on Meteformen 1000 mg for about 7 m months! My friend told me to try the bleach homemade test and did mine came out with bubbles and fizzy! Can I be pregnant and because I'm only a day late but a lot of symptoms when should I test?