So ready for the confusion ?

I have inregular periods but there that inregular they now have become regular to the point I know when I’m going to come on which is normally end of the month sometimes il miss a month and start beginning of the month after il end up having two periods in that month one at start and end , and it goes back to normal , I didn’t start at end of last month and didn’t start beginning of this month either I took some pregnancy test and all negative today i am due on and no sign still and still negative on a pregnancy test , iv gone in for a urine sample at doctors to be sure , should I keep testing ? My periods are not normally like this , like I said they are inregular but they have a pattern that iv noticed iv been hiccuping a lot lately ( not a sign of pregnancy I don’t think ) my boobs seem to a hurt only a little bit when touched and the pain lingers for abit , I had some tingle in my nipples earlier then it stopped and my veins are really visable too , iv been feeling really tired but not sure if that’s down to work or not , just wondering if I should keep testing ? Cause there’s stuff I do like heavy lifting at work and I’m going to a theme park next week so if I am pregnant I want to know before hand so I make sure I don’t do any of these things , sorry for the long paragraph and my grammar .