So my cycle is usually 28days but I'm on day 40 now. I don't know what going on because I took a test and got bfn (4-5 days ago). BBUUUTTTT,, I got it last month on time like clock work... I have not had sex with a man in a month in a half because I'm in a relationship with a woman. I don't know what to think and this has never happened before it's usually on time every month. Advice please???