Maybe a Christmas surprise?

This is my first time posting so I hope I do it right lol! Sunday, Nov30 my husband and I made love. ( first day of buck season was Monday lol) He didn't pull out. Glow stated I was not fertile and there was a 2.7% of pregnancy. I had AF Nov 24-28. As of this week I have been nauseous at times and have had a nasty headache. Headache was Monday and today. Today to the point where I laid on the couch when I got home from work. My breasts are very tender and sore. Due to get AF Dec24. Kind of scared. Have 2 boys already, 13 and 8. Yikes!!!! Any thoughts?