Hello! I need some advice!

I am 30 and had a baby 2.5years ago. Since the birth of my daughter, my periods have been all over the place, prior to being pregnant, periods were never a concern.

my periods returned after 8 months of baby being born due to breastfeeding, I was put on the progesterone only pill and things seemed ok for a while.

for around the last year, I couldn't tell you when my cycle is, it appears randomly, isn't usually heavy but is daily light bleeding and prolonged (this occasion I have been bleeding for 21 days so far)

about a year ago I had a blood test and was advised the ca125 levels were "abnormal" from there, on 2 seperate occasions I've had 2 internal and external scans of bladder, cervix, ovaries, womb etc, both completely clear.

ive contacted my doctor again about the random and persistent bleeding and been told there's nothing more they can do but to change my prescription to a combined pill , which we have done. I just can't help feeling that something isn't right, this wasn't normal for me pre baby and it's been 2.5 years, surely things should be settled?!

should I push for further investigation? Or just allow time for the new prescription to potentially work?