Pregnant or irregular periods

My last period was March 18, after that for a few weeks I would have random bleeds that would come and go. I didn’t know when I would start bleeding so i had to carry a pad on me at all times. That only lasted about a week in a half, 2 weeks. And now, I haven’t bled at all. Glow is quite accurate and says I was supposed to start the 1st week of April. haven’t had a full period since March 18 and now it is already May! I’ve never went that long without my period and I think it was Monday night when I took a test and it was negative. Could I actually be pregnant or possibly irregular periods?