Kimberley Need, 35, from Oldham, Greater Manchester, had been for a 16-week scan and text her boyfriend saying "Love you always my sexy man" in the hours before her death.
An inquest into her death heard she was found to have sniffed gas from a can, having previously done the same to get "a high" as a 12-year-old youth.
The hearing at Heywood Coroner's Court was told she had developed depression during previous pregnancies.
Kimberley fell pregnant again earlier this year and was due to attend an ante natal clinic appointment when tragedy struck on May 23.
Boyfriend Ben Banham told the court he had come home from work to find himself locked out of their home and found her body after calling a locksmith to gain access.
He said: "She was depressed after her last relationship but she was not depressed at the time of her death and she was in a good place that day.
"I went to work and kissed her goodbye and told her I loved her. I was on the phone to her during my breaks and the general conversation was fine.
"She texted me at 5:30 saying 'love you always my sexy man'. I just thought everything was going well."
Kimberley was found slumped on the couch and despite her boyfriend's efforts to perform CPR was pronounced dead at the scene.
The hearing was told no suicide note was found and police found there were no suspicious circumstances.
A pathologist recorded the cause of death as 'sudden death syndrome' from sniffing gas.
Miss Need's mother Christine said: "Kim never hurt herself deliberately or self harmed. When she was upset she would ring her sister.
"She was due for an antenatal clinic appointment on the Friday. I didn’t think she intended to take her own life."
Toxicologist Julie Evans said: "The gas causes the heart not to beat properly and can cause a risk of a seizure. People do it as it can be for euphoric effect."
Recording a verdict of misadventure coroner Lisa Hashmi said: "She comes across as very impulsive and a little volatile. She struggled after the birth of her children but she also realised she needed help.
"I have to say I do not think there is enough evidence to say it is a conclusion of suicide. Her sister described how she had experience in using lighter fluid to get high in the past. It was unlikely she misused it leading up to her death."
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