My husband and I have been using the withdrawal method since my son was born a few years ago, I had a condition during pregnancy which means I can't use hormonal contraception. I spoke to my husband about getting the copper coil but he said why when this is working for us. I know the risks but I would be happy to fall pregnant by accident. He doesn't want anymore children and for this reason he is VERY careful (pulls out with plenty of minutes to spare). We last had sex around 2 weeks ago during my fertile window, once in the afternoon and then again in the early hours. About 5 days later I got really bad cramps in the evening and I thought I was coming on my period early, but it never came. Now i'm on either tomorrow or Friday but I have somehow convinced myself the cramps were implantation pains and I'm pregnant! Realistically how likely do you think this is? We have had sex in my fertile window before and never had a problem.