Sounds like you are ovulating. The wierd sensation in your ovary is probably ovulation, many of us can feel it. Felling nausesous can be for many reasons, possibly from taking folic acid. One of the side effects from folic acid is nausea.
All in all, yes you could be pregnant but the only way to know is to take a test. I tested three days before my period was due and got a BFN, tested two days after period was due and got a BFP. Try waiting until your period is due and test (basically wait another 2 weeks). Good luck!
Also, sounds like right now is the prime time to start BD'ing, your body is trying to tell you that.
please can someone help i need answers