CAN SOMEONE HELP ME WORK THIS OUT?

As far as I know I have a 28 day cycle. I am not activly trying to concievce but not using any protection, sort of if it happens great.

Anyway me and hubby done the deed three weeks ago friday so 23 days ago, I had been off my af for 4 days and was on for 6 days.

My calculations were that I was 33 days in to my cylce but I went on a site and used its caculater. I put in the last day of my af and it said I was due on on the 18th does this sound right?

Can anyone help me as I am experiencing sore boobies, feel a bit sickly now and then, have come out in spots on my chin, and feel tired. took a test on Friday which was bfn but now im thinking it may have just been too early to test.

Thanks again x

 

yes, I came on around the 22nd november, was on for around 6 days, went to bed ( around four days after my af finished which was 23 days ago so I though I was late??