Missed some birth control

So I’ve been on birth control consistently for 6 years. I always take it on time and everything. Well this month I’ve fallen a little deeper into my depression and keep forgetting them. I forgot ones and took it in the morning, then I forgot and had to take two one night. And it turns out tonight that i forgot last nights pill. My bf and I just had unprotected sex tonight. Should I take a plan b to be safe?