My old dog might be pregnant and I don’t know what to do
So technically she’s not my dog but my younger sister dog anyways last year I got a male puppy around this time in June it’s about to be a year since I got him and we haven’t neutered him and my female dog isn’t spayed. So recently she was in her heat cycle and on her period this is the first time I’ve seen her try to rub her behind on my male dog. I noticed that they were trying to mount knowing that they weren’t neutered or speed, I kept an eye on them as much as I could. My female dog is now nine years old and my male dog is about to turn a year old. I’m really afraid of my female dog being pregnant since she’s a Chihuahua mixed with the Yorkie and I heard those smaller breeds have high risk pregnancies. I believe she was in heat about two or three weeks ago and I can’t tell if I’m being extra paranoid, but she does seem a bit more tired I guess and more irritated with my male dog. I took a look at her nipples, but I couldn’t see a difference from before I want to go to the vet, but I really don’t have the money for it. I thought about buying those test kits for pregnancy in dogs off of Amazon, but I don’t know if those are accurate enough. I want to get an abortion if she does have puppies or is pregnant because I just can’t deal with the idea of my dog, passing away, trying to give birth. Any advice on what I should do.