Period & sex

So ladies this happened to me first time and I've never felt so embarrassed in my life ever! So I was with my bf in his car and we decided to go to the back seat to have a quickie and I got on top of him (he had a condom on) and so we started having sex, I literally thought I was cuming and when he tells me baby lay down once I got off i get my period there's period blood on the condom (not a lot just the tip) and I looked at my vagina i was spotting. Cause it was my first day of my cycle and I was so embarrassed 😩 he was like your on your period I honestly didn't know I was going to get it so I had to clean up and he did too! But that just killed the vibe I didn't feel good afterwards I was moody after that so it was a huge embarrassment! Has this happen to anyone or something similar I hope and not the only one? And how did your bf react?