Am I pregnant? Should i be worried?

I usually start my period between the 21st at the earliest, and the 1st of the next month at the latest. It is the 24th and I have been experiencing period symptoms for the past few days but no blood flow. I am having cramps, bloating, my are sore, everything, but no flow. I have had an ovarian cyst in the past that ruptured. I had an ultrasound done and l scan after it ruptured and they told me I would have to go back after my period in April to have another test done, it is now the end of May and just haven't had the time to go. I have noticed irregular but multiple twinges in the area of my ovaries and uterus all this month, can be very uncomfortable and even painful in the wrong positions. I have had unprotected multiple times with my fiance this month. I took a pregnancy test a few days ago, the First Response one that can test you 6 days before your missed period, and it was negative. I have taken these tests many times before and have always been accurate for me. What should I do? I normally will get it right about the 25th, with unusual ones being between the dates that I mentioned earlier. Should I be worried about being pregnant? What should I do?