Experiences with Plan B?!

Hello! So I had sex last Tuesday night and the condom broke right at the end...I am not on any other birth control at the moment and this was my first time having sex in a while. I took plan B the next morning, which was about 12-13 hours later. I should also note that this happened about a week after my last period and a week before I was expected to ovulate. Anyways, the pill made me a little bloated and nauseous the first few days but then this subsided. It’s now been five days and I’ve started spotting dark brown blood and having a few very subtle/minor cramps. Is this normal or has anyone else experienced this before? This is my first time going through this so I’m a bit freaked out. Any feedback or personal experiences would be really helpful, thanks!