I believe it was made sometime between 2000-2011 — All I remember about the movie is that there was a group of people, most likely to be scientists, or the majority of them were scientists, and probably geophysicists – driving to a forest to camp there for a while to continue their researches; they have a van or two. Then some stuffs happen and they cannot leave the place. Also in the mean time, they find an unfamiliar object/living/egg/meteorite/??? (I cannot remember) and somehow they get to learn about its being dangerous, unsafe. This thing/alien I believe usually attacks or do stuffs at night – I remember their wanting to secure all the windows and doors on the van and at some point, one of the windows get/be opened somehow, and one of the people (I am not sure about this part) starts to act strange, maybe the alien was controlling him, or the alien shapeshifted. I remember something bad happening to a woman and then dying. Not sure if she was pregnant, or had another sort of problem, like maybe the alien got inside her body.
As I said before, in the title, I think it is a Spanish language movie, but also might not be – it is definitely a low-budget movie though. thanks!