anyone else had this happen??

Hey girls! So yesterday my S/O and I had sex and before he even finished I started bleeding bright red blood and about an hour later is was brown I had called l&d and they said it should subside. I woke up this morning still bleeding dark blood and now idk if I should still worry and call again or if they will just tell me it's normal again.  I'm 38 weeks and about 4 days, I have really bad back pain that's more like a pinching nerv that hurts with every step I take and on and off Braxton hicks. Has anyone else experienced this?