Pregnant?

Hello,

This may get slightly personal but i’m going to keep it real.
Me and my girlfriend of almost 5 months have been having sex those entire 5 months. She was on birth control but after a while ran out and she has too much anxiety to call and get more (they were given to her for free at planned parenthood or something). However since she got off of it, we’ve been having sex without protection. Reason being, she says she does not think she could have kids due to two reasons
a: she did it every week with her ex for two years unprotected and never got pregnant
b: Her mom had something genetic that made the chances of her having kids very, very slim. My girlfriend thinks she has this however I don’t think it’s medically proven. Her mom also still had 2 kids.

3 weeks ago she was saying that she got a few headaches and felt some things and thought she’d be getting her period soon due to them. She never did. Keep in mind that she had only been the pill then for maybe a month(however I really can’t remember), and I read that you may not get your period after longer after stopping taking birth control. However some period symptoms are the same as early pregnancy symptoms and the fact she never got her period after saying she may be worried me majorly. However again, there’s the whole period may be delayed thing so you can see as to why i’m conflicted confused and worried.
It’s a confusing, scary, risky situation. I’m very worried that she may be pregnant and I want to get her a test, however I need someone’s help in telling me what the chances are. I’ve pulled out very early every time we’ve done it since then and she has not seemed that off and does not believe she could be pregnant at all (due to above listed reasons and the fact that she doesn’t feel symptoms). I’m just worried that maybe now she is from the 5 times we’ve done it in the past couple weeks and honestly I don’t know how to navigate the situation. However what I am doing is wearing condoms from now on, something she’s been offering recently that I am now taking.

So in conclusion, could somebody please help me and tell me some proven facts about what the chances are, and mostly if it should be a genuine, set worry for me and I should get her a test asap, or if I should relax and wait to see if there are any more symptoms. I’m so conflicted, especially after what she felt and her not starting her cycle. It’s a weird situation and I’m trying to figure out if I should continue being worried air on the side of caution and get her a test, or just start wearing protection until she gets more pills and hardly think of it due to her confidence in how she feels and how she knows her body.

Thank you for reading and thank you in advance for your help.