5 weeks pregnant, spotting, and cramping

Hi

This is my first post. I'm 5 weeks pregnant and for the last two weeks I've been cramping. I would say sometimes mild period pain and sometimes full on period pain. however, I had no bleeding.

yesterday for the first time I had some spotting, after I had an orgasm. the cramping after the orgasm was pretty full on and it also gave me lower back and knee joint pains. the pain wasn't that excruciating for me to scream but I would say it was like a heavy period kind of pain. I laid down for some time and the pain lingered on for an hour or so and started to fade away. the spotting continued till today however it has been decreasing in volume. it is only there when I wipe myself and go for a wee. the colour varied from brown, pinkish, slightly red, and back to brown. the spotting is still there. cramps have gone.

since I have found I'm pregnant I have had three. two of which did not end in cramping or bleeding. it was only yesterday that it happened. I should also mention that the orgasm was through clitoris and not intercourse.

I should also mention that for the past few days I have been getting pain in my pelvis. it is really weird, a dull pain at the top and bottom of my pelvis, more on one side.

I found out I was pregnant when I was 3 weeks and 3 days, so 9 days post ovulation. I've had no symptoms other than slight tender breast which comes and goes. any ideas? should I be worried? I've uploaded my but chart as well. I've been keeping it since I've got pregnant.