I am 36 and trying for our fourth child. We have been trying for a year now and I have been faithfully tracking cycles etc. I have been faithfully about every 24-32 days for cycles. I had a cycle Feb 10 and since then have not had another. My boobs have been sore for almost all of March now and I have taken several test and all negative. I had a blood test done a few weeks ago at ten days late. My other kids I conceived no problem. I have friends that tell me that with their pregnancies it didn't show up for weeks and they have healthy kids. Has anyone ever experienced this?