Irregular periods and possible pregnancy

My periods have been irregular as you can see in the picture. I was bleeding for 8 days, stopped bleeding for 4 days, then started bleeding again. Every day with the heart on it is when my fiance and I had sex. We aren’t doing anything to prevent pregnancy or even really thinking about having a baby. If we do we do and if not then we don’t. But I am very bloated, nauseous, and extremely exhausted. I started a new medication for my migraines that is called Aimovig which was just released 6 months ago and doesn’t have much research for side effects. It’s self injecting once every 4 weeks. I’m not sure if I should test to see if I’m pregnant or wait it out. When is the soonest I can test for the most accurate results? I know the tests say 5 days sooner but how accurate is that?