A 33-year-old man has been charged after allegedly assaulting his former partner over several months before being stopped by police and returning a positive roadside drug test in Yarralumla.

Police allege the man assaulted his former partner between August and March, including strangling her and kicking her in the head while she was pregnant.

The incidents were reported and police began searching for the man.

About 7pm on Wednesday, police conducting random drug and alcohol testing in Novar Street tried to stop a  grey Ford Ranger. The driver drove on the wrong side of the road before eventually stopping on Cotter Road.

The male driver was subjected to a roadside drug screening test, which returned a positive result for methamphetamine.

He was arrested and charged with offences including choking, aggravated assault, failing to stop for police, and drug and reckless driving.