This belongs in the tmi section but I'm just wondering.......

Yesterday morning I was home alone (woohoo!) so I had some alone time & went about my day. I had a lot of tightening in my belly during the day & about mid afternoon I was having period type cramping & started feeling pretty blah.
Last night DP & I DTD in our normal way but with a bit more passion & afterwards there seemed to be an excess of fluid (it had been a week so maybe it was stockpiled lol) & when I went to the loo in the low light it looked like blood had seeped onto my undies so I did the mad dash to the light switch & was relieved to find it was just a lot of moisture.
About 2am I woke up feeling very uncomfortable in the tummy, tossed & turned & debated getting the hot water bottle for my tummy which was aching. When I finally fell back asleep I was woken by a sharp pain in my right hip/ribs area that actually made me gasp when I rolled over in my sleep.
This morning there was brown blood in my undies

I'm seeing the midwife on Tuesday so I will definitely be asking her but wanted to put it out there in BB land & see what advice the wise ladies have to offer. I'm not overly stressed, more curious as to what it could be. TIA.