Advice

So I ovulated on 26th June, did clearblue tests on sat and sun and then frer on Sunday afternoon and Monday morning all very faint lines. I did a one step test on Tuesday and it was negative. Yday I started getting brown discharge when I wiped and in pants. Today I have light dark red bleeding, only when I go to the toilet and very little in pants (period was due on Monday) I have lower back and stomach cramps, more a dull pain then normal period. I am also starting to feel nauseous and lost appetite tonight! Am I pregnant or is this period?!