First time taking Plan B I’m so scared

Victoria

Sunday night 8pm I was gettin it on with my sex buddy Noah and we started out using a condom since I’m not on bc then I started going dry and we took it off to just have some raw sex for a bit and then we were going at it real hard and he’s never came in a girl before and I was so out of it enjoying it when he asked if he can cum in me I said “fill me up” and then regretted it immediately after he did

Then we both started to freak out and said we are going to Walmart for Plan B and then they didn’t have it then giant eagle didn’t have it so he said he wants to be with me when I buy it so I drove 20 minutes to a giant eagle at 9 at night found it and then went home

Took it around 10pm ish after having a mental breakdown and feeling horrible and shitty and stupid.

Day 6 of my cycle a day after my period ended.

I took it Sunday night.

I’ve had headaches off and on and cramps. Real bad cramps and I’m still so scared he’s terrified and I feel horrible and I’m scared Plan B didn’t work and I’m going to be the 1 out of 8 women who take Plan B that get pregnant

Any advice?!?!?!