How long have you been with your gf? Is she bringing up marriage a lot? If you've been with her say, a year, this is ridiculous. If you've been with 3 years or more, then I would say a lot of moms are this way, but most aren't going to call and pressure you into it. Absolutely do not get married because of her parents pressuring. Don't marry her out of pressure, fear, or stress. Don't marry her if you aren't sure she's the one. But you're 26 and she's 24, if you've been together for more than 3 years and still don't know if she's the one or if you want to marry her, you should probably let her go to find someone who does want to get married soon so that she's not waiting until youre done pursuing your dreams (but marrying and having children soon might be her dream that she wants to pursue, understand that this might make you incompatible) and she's almost 30 (especially if she wants kids, after 30 it will be harder for her to get pregnant, she will have more risks). You two may have different time frames and goals for marriage, you should ask her about this asap.
Also, consider: 1. Don't wait until the "perfect time" to propose and get married. There will never be a perfect time. Whether you're waiting until you finish your degree, but then you want to wait until you have a home financed, or until you get this promotion, etc. Theres no such thing as a perfect time, if you wait for that you will be 40 before you are in the perfect situation. Do it when it feels right for you and when it feels like marrying this person is your dream and something you want more than anything, not a box to check off.
Don't ever get married due to pressure from anyone. You will resent your wife the rest of your life if you marry out of pressure.
Never go into debt or dire finances for a ring or wedding. Most weddings are paid for by the brides family anyways. But the grooms family pays for the rehearsal dinner and honeymoon. Stay within your means.