Is four days enough to experience withdrawal effects?

I ran out of Lexapro. (Not great I know) My last dose (15 mg) was on the 3rd at night. I’ve been taking this medication for about four months at this point. I noticed I ran out on the 4th, the 5th was a Sunday (so pharmacies were closed) and the 6th was a holiday so pharmacies were also closed. I’m supposed to go pick up my medication today.

I have not experienced withdrawal symptoms. No rebound of depression or anxiety, no brain zaps, nothing. Is it too early to have withdrawal symptoms or does this mean Lexapro gives me no withdrawal effects?

I also take mirtazapine (tricyclic antidepressant) if that helps. Feeling a bit weird at the complete lack of withdrawals