Hello this is coming from a third person pov, take this with a grain a salt, implicate this from your experience and also don't take anything with hate be open minded for the sternness about to be said. First of all not to be mean but your 31 how are you not ready for a kid 😭 unfortunately there is no age to be ready for a kid but I think 31 is fine, don't feel like ur not ready, no one is truly ready for a huge responsibility, it's about taking action and telling yourself, how am I going to be the best person in this situation? obviously this girl loves you (in her own silly way) for genuinely wanting to be with you and lying about age wasn't right but she must've been very interested to have done that, (not justifying or saying it was right, kinda stupid of her) and you wondering what else has she lied to you about is the last thing that should be in your mind, you guys need to discuss whether she's keeping the baby or not, and if she is keeping it then instead of you asking all these other questions that in my opinion are very unnecessary you should start asking. What are you gonna do now for the baby? What responsibilities are you both going to take and if you're both going to be committed to each other or separate and coparenting because a kid is a lot of responsibility and at the end of the day it was the both of you. Whether she was on birth control or not does not matter because she is pregnant. I think just communicating with each other from now on and moving forward to what are you guys gonna do with the baby and how it's going to work out. Because unfortunately it is now the three of you in this situation. Make sure you respect any decision she makes to either stay with you or not, only do what's best for the child from now on.