Gender..?

Nicola • Married Mummy to 2 girls and 1 Angel baby, pregnant with my 🌈
So I went for my 20 week scan and all was well with the baby. At the end I asked if she knew what the sex was and all she said was that she couldn't see anything between the legs. She wouldn't say for certain that it was a girl. What do you guys think? Shall I start buying pink? I have another scan at 32 weeks...shall I wait until then..? Confused!