Pill advice

I am on the combined pill I do take it every day not at the same time like you're suppose to but i do take it every day now last week I forgot to take a couple of my pills and had a period or breakthrough bleeding but this occurred during my most fertile days according to the glow app now i did not have sex during my period but the day after my period finished now the question I'm asking is I'm starting to feel really wierd like nauseous in the evening and sooo tired all the time now my breast feel really sensitive is there a change i could be pregnant or is this just my hormones and I'm being paranoid would really like some advice it's too early to take a hpt