Pregnant??

Ok so last month i got my period normally on the day i should but it was super light & that’s not normal for me because I’m usually very heavy on my period days & when i got it, it only lasted for 2 days. Now j have with this app bc i log in when i start my first day of my period but then i forget to log in when my period ends so when i go back into the app I’m like a month behind so i just put whatever day that my period ends so its not accurate. So this month me & my bf has sex & he said that when he was eating me out he saw white stuff but he wasn’t sure if it was him or me & yes we did use protection. The app said my period was suppose to start 11 days ago. A few hours ago i felt slight cramps & i went to the bathroom & i had really light blood but then after that i stopped bleeding. Also i took 2 pregnancy tests & they both came out negative. What could be going on??