Question about precum? Please read all and answer honestly?

So, say you ejaculated two days ago, and haven't ejaculated since. Also, you've peed a lot of times after your last ejaculation and you've also cleaned your penis when you showered. So, you and your girlfriend do some foreplay today(oral sex, dry humping, making out) and things get carried away and you decide to have sex for roughly 30 secs with an inch deep penetration and you don't know if you precummed, So, you pull out and you ejaculate away from your girlfriend's vagina a couple minutes later. Do you think she might be pregnant(her last period was 20 days ago and her periods are irregular)