My husband and I decided to use NFP instead of BC. I got off of the pill in early September and began using glow to track my data. I followed my calendar, and we used back up birth control on the days glow said I was fertile. I had sex on Monday, October 5 and Tuesday, October 12 unprotected. I haven't had a period yet, and I began to feel really bloated, somewhat nauseous, and my breasts have been tender. Looking back at my data, I think I may have been fertile on the 12, which was not aligned to what the app told me (BUT i hadnt even used it for an entire cycle yet, so I completely take the blame on this. It didnt have enough data) I took two pregnancy tests in the last 7 days, and both came out negative. I won't ask if I could possibly be pregnant, I realize that it's a very real possibility due to an oversight on my part. However, because of the transition of birth control and the possibility of my fertile window being off from the app, I'm not sure when I can test and get an accurate reading. Any suggestions?