Is my period normal?

Im a bit confuse with my situation. I am 30 years old and most of my periods have been okay, some disconfort but nothing that would stop me from doing things. I just had 2 exceptions in different years where my pain was more than normal but that's it. A few months ago I had my third awful painful experience and decided to go to the doctor for that... doctor decided to take blood and urine samples and all the results were fine. I said the pain happened in the first two days of the period and lasted mainly for few hours, then the pain is gonne and I continue with normal routine. With all this doctor said as he could not see anything rare in the results and pain was not constant there was nothing to worry. Now my last period same thing happened: first two days I get strong pain for few hours.... so, should I follow the adive of this doctor and consider this pain to be fine and just ignore (I have been working while in pain but it is hard to ignore it) or should I check with another doctor? Is it possible if there is nothing serious that blood and urine won't show anything rare? Should I just request for other tests?