don't know if I should take a test or not, need opinions

Faith 762
My bf came in me a little about 3 weeks ago on the last day of my period. And then 3 days after my period ended I had very light bleeding for 2 days. And for 2 weeks I've been on birth control. I started having very light bleeding again yesterday. My bf still is insisting that I take a test but I'm not so sure....