I'm 5 weeks preganant, i take benadryl (diphenhydramine) every night to help me sleep. with this hurt the baby at all?

It's ok : Benadryl (diphenhydramine) is safe for use. A daily walk or other exercise usually helps sleeping patterns too.

Other options:: 1. Keep regular bed ; wakening time (includes weekends). Get up same time daily. 2. Make a regular, relaxing bedtime routine: warm bath or shower, aromatherapy, reading, or listening to gentle music. 3. Sleep in dark, quiet, cool room w comfortable mattress ; pillows. 4. Use bedroom only for sleep ; sex. Put work materials, computers, ; tvs in another room. 5. Finish eating at least 2-3 hrs.