To answer this question, we need to first establish the context of who Rip and Beth are. Rip and Beth are characters in the TV series Yellowstone, which premiered on the Paramount Network in 2018. The series follows the lives of the Dutton family, who own the largest ranch in the United States, and their conflicts with land developers, Native American tribes, and other rival ranchers.

In the series, Rip Wheeler is a ranch hand who has worked for the Duttons for many years. He is fiercely loyal to the family and is often involved in their disputes and battles. Beth Dutton is one of the Dutton siblings and is portrayed as a tough, independent woman who is not afraid to speak her mind.
Throughout the series, there are hints that Rip and Beth have a romantic history, although it is not fully explored until later seasons. In season 3, it is revealed that Beth had a miscarriage when she was younger, and it is implied that this event had a profound effect on her life and relationships.
In season 3, there is also a subplot involving Beth’s efforts to have a child. She undergoes fertility treatments and is shown taking a pregnancy test, but the results are not revealed.
As of the end of season 3, it is unclear whether Rip ever finds out about Beth’s pregnancy or the results of her pregnancy test. The series leaves many plot points unresolved, and it is likely that this storyline will be explored further in future seasons.
However, it is worth noting that Rip and Beth’s relationship is a central theme of the series, and it is likely that their romantic history and potential future will be explored in greater depth as the series progresses. It is also possible that the storyline involving Beth’s pregnancy will be revisited in future seasons, providing more clarity on whether Rip ever finds out.
Overall, while the answer to this question is currently unknown, the dynamic between Rip and Beth is an important part of Yellowstone and is likely to be further explored in future seasons.