Prenatal Vitamins Spotting?

Hi ladies,

Happy Friday and hope everyone is doing well!

I started taking a new prenatal supplement 3 days ago as my partner and I are preparing to start actively trying again after a break.

So far I've had the usual side effects, TMI but yellowish pee due to the B vitamins and stomach pains/bloating due to the iron. Hoping my body will adapt soon 🤞

Today I took an OPK because I know this is the beginning of my fertile window & I got a darker line but not yet positive.

Just been to the toilet and I have some light spotting. I sometimes have spotting around the time of ovulation but this still feels too early.

I'm a little worried and I'm wondering if anyone else has experienced spotting as a side effect of prenatal vitamins? and did it stop? or if this is ovulation/related to something else.