Will the L tourist visa single entry be valid if I go to Hong Kong and Shenzhen first?

I will be visiting Beijing this coming May 16 to 21. I already have an L tourist visa single entry. However, I will also be visiting Hong Kong plus Shenzen on May 1 to 4 which is a week earlier than my Beijing trip. As a Filipino we are not required a visa for Hong Kong. I will be joining a group tour in Hong Kong and a group visa will be provided by the travel agency for Shenzen. I am just concerned if my Hong Kong/Shenzen trip be considered as an entry to Mainland China? Will the consul at the airport regard this earlier trip as entry to mainland China thereby making my L tourist visa for Beijing already void when i will be having my trip there? Thank you and i hope to hear a reply very soon.