My 14 yr old might have gotten his gf pregnant, do I tell her parents?

Question

Update: 
So learning more about the situation, they had sex 8 days ago so it’s likely too early to test anyway. They used protection and he was too nervous to even finish so the likelihood of pregnancy is very low. We’ve agreed that from now on when she’s over, they won’t be spending unsupervised time together as much. I talked with my son about it and he said he knew he wasn’t ready and he is not willing to take this risk again. He is very freaked out by the whole situation. She does have another test and will take it again in a week because by then she’ll be 14+ days from the event. 
🤦‍♀️ I am such a careful parent and have always had a great relationship with my kids. We talk openly about anything and everything. I am surprised by this and how naive I was thinking that they weren’t having sex…I assumed they were doing stuff but not this far. 
I did talk with her and her reasoning for not telling her mom is pretty simple, they don’t get along and spend zero time together so there’s little to no trust there. 
My plan at this point is to have a conversation with the mom and tell her “the kids are approaching their one year anniversary and spend a lot of time unsupervised. I’m concerned that they might be thinking they’re ready for the next step” and if she gives push back on it, I’m totally planning to just lie and say “well I walked in on them the other day and they looked pretty close to it”. I don’t know if that’s the right thing to do but that’s my plan. I really appreciate everyone’s input so far and welcome any more input or criticism on it. 
Hello, 
My 14 year old and his gf have been together for almost a year. They spend time together every week, go to school together, and recently decided they were ready for sex. I have talked to my son about sex before, when he was 13 and more recently. He bought condoms and they used protection. I wasn’t aware that they thought they were ready for this step. Anyway, fast forward to tonight. She mentioned that she was late for her period but is sometimes late. He asked if I could buy her a pregnancy test. I’ll save the details of that conversion and what I said. Long story short, I bought the test (well a two pack actually). She wouldn’t take the test at our house, which is ok. We dropped her off at home like we normally do. My question is, what is my responsibility to her parents right now? Should I be telling her parents what they’ve confided in me? I feel very uncomfortable having bought her a test. She did tell me that she told her mom she was late and her mom said it can be normal and sometimes stress can trigger it. I don’t think her mom knows that my son and her daughter have had sex. I’m not sure if I need to tell her or how to handle this situation.

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No, don’t say anything until you know exactly what’s going on.

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I just want to say I’m so impressed that your son was confident enough to tell you all this! Wow, that’s awesome! I hope she’s not pregnant of course, but I’m glad you have such open communication with your child and his significant other.

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No. Thats their responsibility. They figured they were old enough for sex then they are old enough to discuss it w her parents.

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I would not tell her parents unless it comes back positive. It’s good that she confided in you and trusted you, and telling her parents before it ends up negative/positive could ruin that trust

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Commenting for the update!!! Good luck

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I wouldn’t. They told you because they trust you. You bought her the test. She probably wants to do it on her own when she’s ready. Since they trust you, they’ll tell you what happens with the test. She said late periods are normal for her. Wait and see. This could be a teachable moment for them to decide if they’re really ready for this.

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If that was my daughter, id want to know.

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I wouldn’t. You don’t want to ruin that trust they have in you.

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Only say something if the test comes back positive but I really hope it doesn't wven though it's highly unlikely. What a mess. I'm really sorry.

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No. Don’t have a conversation with their parent. That can lead to consequences you aren’t aware of. Your child is your responsibility not the girlfriend. Your son used protection and didn’t even ejaculate inside of her. Your job is to educate your child on sex. He took the necessary steps. Don’t contact her parents.