Can Bloating, Stomach Ache, Nausea Be Due To Missing Birth Control Pills?

HI: I am on birth control pills which I missed 3 pills last month. I am also on Depakote 1000mg. I am 10 days late for my period. I am light headed, stomach ache with nausea, bloated and somewhat irritable. I have taken a home pregnancy test which was negative. Is that accurate and should I continue my meds?