Advice please?

My cycles are usually around 30 days, but this time my period came on CD 36 - this is very late for me so I took a pregnancy test at the time which was negative. During the cycle I had about 6 positive ovulation tests on different days. I also had severe nausea and headaches towards the end of this cycle.

I am still now bleeding on CD10 (usually bleed for 5 days) and around CD2/3 I had horrendous vaginal pain and lower abdominal pain which lasted around 30 minutes. It was so bad that I couldn’t sit down as any sort of pressure was causing agonising pain, after about 30 minutes the pain subsided but was still there for the rest of that day, but mild.

I usually get heavy bleeding for the first two days then it eases off, but the bleeding I am having now and have had for the last 10 days is very light and watery. It started as brown, and is now bright red/pink.

Any ideas what could be causing this? I have never bled for more than 5 days, and due to the pain I experienced on that day and the nausea and headaches I had I’m wondering whether I should consult my doctor or just wait and see if it goes back to normal on the next cycle?