Too scared to test

After almost a year of trying with meds and IUI because of PCOS we decided to take a break in December to just enjoy the holidays. We did try to have sex at the right time but I didn't do ovulation tests or anything (just kept an eye on my CM). Well I am now CD 33. No period yet. I took a dollar store test on Dec 26th and got a BFN. I keep feeling like my period is coming with cramps and acne. But no Aunt Flow! Glow doesn't have my period coming til the 1st. Should I wait until then? Can't decide!