Help?

I'm 3 days late for my AF , I was supposed to start on Nov , 28 and I haven't yet, now I felt like I was having cramps on that day like I was gonna Starr but didn't and today I was at work and I felt really wet down there so I thought I started, but I didn't. My period is regular and only four days at most. If anything my AF comes early? Me and my husband were trying for a while but gave up and just decided to live life normally, well I'm thinking maybe that was it, at least I'm praying, we have been trying for 2 years now, we split up for 5 months and he apparently has another women pregnant, which I love him enough to over look, but it makes me wonder why her and not me, she was a one night stand? I want this so badly I can feel it. Anyone wanna give me some advice , maybe tell me there story's if the same?