Having Laser hair removal. I have been out walking in the sun. Is this bad?

I have been getting laser for a year now. and have tried my hardest to avoid the sun. But the past couple of days in london have been very sunny. I haven't been out laying in the sun. But I have been walking around. trying to avoid it. My skin isn't tanned but I'm sure I have picked up a tiny bit of colour as I have ethnic blood. I have not been using sun tan cream. Is this bad for my skin. also if I did wait abit longer would the laser not work properly, thanks