Possible pregnancy + mental health

So my story is the oldest in the book. Had unprotected sex, now my period is late 5 days. I know it’s 100% my fault ... and if I am pregnant, I plan to keep the baby. But I’m so scared because I’m in depression and anxiety medication and my quality of life before medication was NOT good (read: suicidal) I am so fearful that if I get off the medicine to protect the baby that I will be in a terrible mental state for 9 months.

It COULD be something else like stress or diet because both have changed significantly in the last month but I’m just trying to think about all possibilities. I took a pregnancy test yesterday and it was negative but it’s still very early. But my period being late is NOT normal. It always happens like clock work. I haven’t seen ANY spotting or anything which is alarming.

I guess I’m just looking for encouragement or advice to anyone else who’s been in this situation ....