Implantation sickness

Hi all

I think I ovulated late last week sometime, I wasn't home a lot so doing opks were abit all over the plac.  I usually get a fade in, a very strong positive then a fade out but because I was only able to get last thursday which was alomost positive and then Friday the lines were about the same then when I was able to test again late Sunday it had lightened off so thinking somewhere ground Friday saturday ish.  Anyway I was wanting to know about implantation sickness, could it be real? I was out Friday night with friends drinking and I drank about what I would normally drink. Anyway yesterday woke up being sick all morning! Now I'm not usually a being sick hangover person, just headaches and feeling rubbish usually, I'm 25 drink most weekends and could probably count on one hand how many times I'm actually sick. So I thought maybe something I'd eaten but I have horrendous ibs, really sensitive tummy so usually if I have anything out of sorts I get dirahhea (sorry!) straight away. I thought a bug  but again there usually both ways. I've never had this before a day Being sick. Mostly morning, a couple times in afternoon and once at night. Feel nausea this morning but don't feel like in going to be sick, jut left over affects I think. Let me now if you have any thoughts or experience. Thanks xx