I hope you are holding up well. Something similar happened to me in my first trimester with Danielle. Ater DTD I had some light pink MC. The doctor said it was a burst blood vessel (how embarassed was I!!) and it was perfectly normal to have it as heaps of blood is flowing around there and if one gets a bit full and with a bit of pressure - pop!! It's not serious at all.

Hugs to you - if it helps - I've had it again this pregnancy already too. Let us know how you go.