I have recently had a 10-hour throwing up session due to a severe allergic reaction, however, my period began a day after and it’s almost like a tar consistency and colour (intensely deep red, practically pure black), is that something I should be worried about, perhaps they’re linked or am I just being paranoid? Obviously googling symptoms aren’t always great, but I’m not sure if it’s something to be concerned about considering I am on the injection for contraception and it’s normal for them to be dark as the OBGYN explained, however I’m still confused and slightly worried..