crazy question

so my period due on Saturday I ovulated the 16 and 17. And I had my period March 3. this morning I woke up dry heaving and then took a first response and it was negative. then I dry heaved again. well this afternoon me and my dh had sex and immediately after I got nauseous like I was going to vomit. can someone tell me what is going on with me please. are these symptoms of mps or pregnancy??????