Yes, this is possible.
Don't forget about the mentstrual cycle - few people have a 100 percent regular cycle with ovulation day in and day out.
The most ideal thing is condoms. If, for some reason, you are not ready to use them, and it is not always good to put a girl on oral contraception, try using suppositories - they affect sperm motility, plus they have a slightly lubricating effect. But on issues of ejaculation - it will still be true not inside. Don't forget that they don't work against STDs.
PPA is not a method of contraception at all. Let's stop calling him that, everyone will be better off. And then there are a lot of practicing idiots. So is the calendar method. I just can't figure out why people are more afraid of flying in than catching herpes or something worse. And they stubbornly believe that they need to protect themselves only so as not to get pregnant. The vagina will bloom, the penis will fall off - fuck! But it didn't fly!
Pre-ejaculant really does not initially contain spermatozoa. But if intercourse is not the first in a night race, then sperm may remain in the urethra after the man has finished for the first time. And upon repeated contact, the pre-ejaculant will "wash" them straight into the lady's vagina. If you pee between sexual intercourse - you can be calm, all the sperm died ingloriously, washed away by acidic urine. And if not, they live there for themselves, waiting for their finest hour. And the lubricant can theoretically "throw" them to their destination. Of course, getting pregnant in this way is very problematic, but theoretically it is possible.
The information that 19% become pregnant with PPA is a little disorienting. This does not mean that almost every fifth sexual intercourse with PPA ends in pregnancy. The effectiveness of contraceptive methods is measured by the Pearl Index. This is the number of women out of 100 who become pregnant using this method of contraception for a year. According to various sources, Pearl's PPA index is approximately 15-30. Such a meager indicator of this common method is due to the fact that not all craftsmen take out on time. For comparison: a condom has a Pearl index of about 3-10, and a pill has less than 1. At the same time, a condom also protects against STDs. Therefore, having a partner with whom you have not yet been tested for STDs is the only reasonable method of contraception. No matter how much you trust each other. A person can be a carrier of a disease from birth without visible or tangible symptoms, and at the same time not even knowing about it. And he can easily infect another - but this other will already feel the full power of the symptomatology.
And yes, I just brazenly took advantage of this question to once again scream that you need to protect yourself! Protected sex and planned pregnancy are your bros. Ridiculous attempts to avoid flying at random are not your bros!
The likelihood of getting pregnant before ejaculation in a man increases significantly if you have sex a short time after the last ejaculation of your partner. So, as in the urethra along which the sperm is pushed out, it is the same sperm can remain, settle down the "walls" so to speak, after which at the time of copulation it can also enter the vagina with pre-ejaculate with quite logical consequences.
Israeli studies from 2003 confirm that there are no sperm in the pre-ejaculatory fluid. This is a very common pseudo-medical myth. That is, until the moment of ejaculation, a woman will not be able to become pregnant.
At the same time, interrupted intercourse is still a poorly effective method of contraception, WHO cites data on 19% of pregnancies when using PPA. This is due to technical problems with timely interruption of intercourse.