Why am I feeling so SICK please help me!?

Me and my bf had sex last Friday and he came inside me and that was the last day of my ovulation but a week before that we had sex again and he came in me then also.. ever since this past week I've been very very emotional and sad and stressed and feel fat and bloated and just really emotional negative and I've been having discharge a lot and my head kills me and feel dizzy and really tired... I sleep in soon late I should be getting my period in 4 days and I'm taking birth control but a very low dose 1.5mg I believe and sometimes I take it took early like 10 or 20 minutes but not all the time... I'm just wondering what's going on?

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