Help!

Rachel
So my partner and I have been ttc for 3 months... I missed my period this month but took 4 tests and they were all negative. Today I took one on a whim and it's saying I'm pregnant. However last night I did an opk and it was positive so could it just be that I'm ovulating . My friend is saying you can't get a false positive. I don't want to get my hopes up but is this definitely a positive. ..I Darenth believe it