Can anyone help me?

I got off bc in jan and have normal periods until June when my husband and I started TTC. Since June my periods have gotten later and later- I'm now on day 46 and still no period and no positive hpt. Can anyone tell me why this might be happening? I'm very worried I have pcos or will have another form of infertility. Also I've been experiencing cramping for the past week with no AF . If anyone could tell me anything I'd really appreciate it!!!