Missed period

Shelby
So I took the birth control pill for a month and I missed a few doses. I'm late for my period, I tested on Saturday and got a negative test. This week I'm feeling nausea, I have bad gas, indigestion, dizziness and bad acne. I've felt no cramps. Last week I wiped once and had like 3 drops of blood one day. I'll retest again at the end of the week if i still have no period. What do you ladies think? Pregnant or maybe just from the pills? I've been on the pill before and never had this problem. I've never missed a period regardless of whether I was on birth control or not.