Blood Pressure

First I would like to say I have a dr appt already set to ask him about this. But thought I would post here and see if anyone else has experienced this. I have high blood pressure so i check it numerous times a day. I also always check it after a work out. I have noticed the last few times after a long bike ride my BP has dropped when i check it. normal for me is 125-130 over 75-80. but when i check it after bike rides its 100-60. With in a few mins of checking it i will check again and its gradually coming back up to normal. Usually within 5-10 mins its back to normal. Is this normal does anyone else experience drops in BP like this.