Pregnancy and low blood pressure?!?!

Every morning around the same time at work, I feel super light headed and almost black out. I always have to sit down and try and caught myself before I completely fall out. I eat breakfast and drink plenty of fluids. I also take my prenatal vitamins at night because they used to make me feel nauseous (in the 1st trimester). The last few days have been awful with feeling like I’m fainting and I checked my blood pressure. It was 90/40 which is super low for me. Mine usually runs 100/60ish. I’m 17 weeks pregnant with a baby boy! Any advice? Wanted to ask y’all before I called my doctor. I have an appointment in 11 days so I’m trying to hold off. Thanks in advance!