could I still be pregnant

I took an opk test this morning and there was a faint second line could it mean that I could be pregnant? My symptoms are sore nipple nauseous on and off a clogged nose my bbt temps are staying in the 98 range but this morning I woke up to light brown spotting and a little bit ago I had blood but it wasn't heavy and no blood clots or cramps. Could I still be pregnant or not? The app says my period could be here the 2 or the 3.