Iron tablets!!!

I’m 7 weeks pregnant on Saturday, I’ve been prescribed iorn tablets, just wondering has anyone ever experienced brown discharge little amounts while taking this? It only started as soon as I started taking it, also when I don’t take it during the day I don’t have brownish discharge either ( I take it 3 times daily) just wondering if anyone’s experienced this before..

edit; it isn’t heavy only when I wipe been on and off(hardly on) throughout a 24hour period, I have no pains with it other than the usual pregnancy pains lol majority of the time my discharge is just the colour of my pee(tmi) just the odd brownish bit