Pain in the ovaries (left side mainly), stomach and lower back area started on Sunday 18th March. Period due on Saturday 24th March - don't experience cramping before period. Had unprotected sex on the 10th March. First day of last period was 25th March. Suffered headaches, tiredness and feeling sick. Pain stopped on 21st March. Had pink/brown discharge early morning of 22nd March and by mid afternoon, pain started again plus heavy period with large clots the size of a 5p piece.
Since you had unprotected intercourse during your ovulation or fertile days possibility of pregnancy can be suspected.The symptoms as pain in the back and stomach with pink discharge is also suggestive of that.
Now you started experiencing heavy bleeding with clots which can be indicative of possible miscarriage.Considering your age irregular bleeding can also be a premenopausal symptom.
It is difficult to comment without clinical examination and it requires pelvic examination and investigations as USG scan and Hormonal Analysis which would help in ruling out the exact cause.
Kindly consider visiting an Ob/Gyn to rule out the exact cause of the described symptoms.
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