It doesn't look like an implantation dip to me either, but remember, you don't necessarily need to see a temp dip to be pregnant... Most often the temp dip will be at least 0.3oC, and most commonly occurs for one day only. That said, every woman is different, and charts can vary greatly!

Your chart looks really good though - nice steady rise of temp in the luteal phase, definitely a fertile cycle and a great chance of pregnancy. Best of luck to you