Can I still get pregnant even if he didn't ejaculate?

First of all, how do you know that you ovulated December 1st? If you are using an app to tell you, you might as well stand back and throw a dart at a calendar. Those apps are "guesstimates" at best and certainly not reliable enough to use them for pregnancy prevention! They are based on averages and a 28 day cycle and a woman is rarely regular or average. Even dedicated charters who chart their basal temps and cervical mucus every day for years have times when they are wrong on their ovulation date. It doesnt matter in the least whether a man ejaculates (cums) inside of you or anywhere else or for how long you have sex. If he penetrates, you are exposed to sperm. Men leak small amounts of sperm all throughout the sex act, granted the majority are released during ejaculation but it only takes one to get you pregnant! So pulling out prior to ejaculation does little to nothing to protect you. So yes, you CAN still get pregnant. The only way to prevent pregnancy is through a good reliable birth control method. Nothing but abstinence is 100% but hormonal methods, like "the Pill" or birth control pills, are 98-99.9% effective when taken correctly and consistently. This is about as good as it gets. There are many different options of hormonal birth control to choose from-Nuva Ring, the Ortho Evra "patch", Mirena, Implanon/Nexplanon are all around 98-99.9% effective but most of them require correct consistent use for best effectiveness. See your locan clinic, Planned Parenthood or your personal gynecologist and ask about the best options for you and stop risking yourself like this!

Ok, I have a few things to say. If a male enters you you can get pregnant. They secrete sperm long before ejaculation. Get on a real birth control before you end up pregnant. There is no way you can know when you ovulate, those apps give you a guesstimate based on an average, and most women aren't average nor do they always ovulate at the same time every month. You measure your period from the start of one to the start of another.