Nexplanon question

So I took plan B on the 24th of January. A week later around the 31st, I began to bleed but not a lot. Thinking this was my early period because of the plan B, I got my Nexplanon inserted. I’ve been lightly spotting ever since it’s been in which was on the 1st of February.

The doc told me to use a back up method for about a week

The first two days we didn’t have sex. But the next 4 days we had sex and he pulled out way before he felt like he was going to ejaculate.

Yes I know this was incredibly stupid. But I would like to know the input from you guys. They say if youre on your period when you get nexplanon then you’re automatically protected.

But I just don’t know if the period I got was just spotting from the plan B. Or my actual early period from my plan B.

I’m just freaking out a little and need advice, not criticism please.