Femara confusion

I am so confused any comments greatly appreciated ....first day of AF was 12-25 I started famara twice a day starting on day 3 of cycle ..I am pretty sure I ovulated this cycle....I took a test this am because I felt like I could vomit...I have super sore bbs ...cervix is high soft and closed...temps are higher than norm vivid dreams extremely emotional...anyway it was a BFN ...could it still be to early to tell?? I have pcos and don't o on my own so I'm not sure what to look for