Red/brown discharge during 2nd trimester

Hey mummies, have you ever experienced red spotting during ur 2nd trimester? I'm 20wks now and started to have spotting 1 week ago, went to see my gynae and seems everything is fine. Did a swap test and inserted a pill for fungus. However it started again within the week and changed from the initial brown colour to red clot. I'm quite worried, anyone experienced it can share some info? Thanks!