Early bfp?

Mrs helms
So I have 10 year old twins so I'm kind of wondering if it increases chances.. But my question for you ladies is did you test early and get a dark bfp? I tested 9dpo and the test immediately showed positive... Now I'm 12 dpo and thought I'd do a little test and take a test in the evening (diluted) to see if it showed up as fast... And it showed even faster and darker... Do you think this is indicative of twins or did this happen to any of you??