Antibiotic side affects

Hi guys I'm on a 7 day course and it started literally 2dpo and iv been having horrible side affects due to them which are like pregnancy symptoms!! Horrid nausea, really metally taste, tiredness, the one thing I'm finding odd, is practically no cm!! I'm normally at the lotion stage but nothing!!!! Has anyone been taking antibiotics while in 2ww?  hat's you experiences??