TTC but...

me-me

so im ttc and my doctor knows this. I asked if my blood pressure medication is okay to get pregnant on he says oh ya for sure just come in as soon as you think your pregnant. thinking I got the green light then I call the pharmacist and ask if it's okay just to check and she says only for the first trimester and still it's a little iffy. I don't no how comfortable I feel with my doctor now. should I go in and demand he change the med or should I just do as he said and come in as soon as I think im pregnant..im so confused and i have never really been comfortable with my doctor..so I don't no what to do

sorry it's Abit long..