What Causes Irregular Vaginal Bleeding, Dizziness And Heart Burn?

I missed my period last month, my period is irregular but I always end up getting it in the beginning of the next month. that happened 2 times already but it didn t this month. I been going to the bathroom every 1 1/2 hours, when I get up I get light headed, and I have been gassy. Oh and I was bleeding but not heavy, but there were 2 days where it was heavy and I got cramps for like 1 minute, but days later I had pink discharge. Today I had a little heart burn, my lower tummy has a small pain when I push on it and my boob has been sore. I took a pregnancy test like couple weeks ago it came back negative, but I m guessing it was to early. Can it still mean I m pregnant?