Paper Girls #14 by Brian K. Vaughan

Stranded in the distant past, the girls struggle to protect a pregnant local while decoding a piece of future tech that might open a way home. Their fragile alliance is threatened by the arrival of time-policing enforcers, and a heartfelt confession complicates their friendships. As danger closes in, they gamble on a risky escape that could separate them—or save them—from the prehistoric stand-off.