Mama, please talk to your OB about this one, safety during pregnancy is so important, and every pregnancy is different, kaya mas better na marinig mo directly from your doctor ano ang okay para sa iyo. At 5 weeks, best na ma-check mo na rin if everything's progressing well. A few of us moms have different situations din, some were told okay lang small rides, iba hindi, so really, your doctor lang ang makakabigy ng best advice para sa your pregnancy specifically. Take care!