Should I test???

Yennesi

So currently my period is 17 days, I was diagnosed with PCOS probably a little over a year and I’ve been taking metformin ever since. Before the metformin my period was very irregular but ever since I’ve started it I’ve gotten a period every month. I feel like I should test but I just don’t wanna be sad again if it comes out negative. What do you guys think, should I test or just wait to see if my period starts next month.