WOMEN WITH IRREGULAR PERIODS I NEED YOUR HELP !

I had a period last month and nothing came this month but all thru last month we had sex like crazy....I mean literally the day it stopped you couldn't stop us.....I say we prolly had sex all thru the rest of March 2-3 times a day and atleast 3 days a week (We work a lot so it maybe more then that) But anyway nothing showed up this month and I've been having weird cramps since last week.....I wanna take a test but I honestly think I'll get a negative because that always happens.....What made some of you guys test ? Or did you ever get a BFP with irregular periods ?