Last AF Day

The last time AF visited me was Jan29 & it was very short & light, maybe 3-4 days. Now before my cycle starts, I have pressure on my tootle & just my nips hurt. I have a 45 day cycle & it normally lasts for 5 days. Today is supposed to be my 3rd day of AF but she hasn't come. Lately, I've been feeling really nauseous & my breasts (not just my nips) are sore. I feel myself dozing off during the day & this has been going on for about a week. My bf wants to get a pregnancy test but since I know my cycles are irregular I want to wait it out. Not sure what I should do.