Spotting!!

Hello! So I am new to this went off birthday control in middle of March been careful last few months .. now we are trying to conceive.. well I got my period May 16th and it ended 7 days after that which it hasn't lasted that long on 10 years.. beginning of May we had sex unproctected..then period came but it was lightly spotting whole time except for 2 days.. I thought it ended on May 19th.. woke up with a migraine puking and very dizzy and lightheaded.. it finally ended the 22nd since then we have had sex unproctected 2 times.. but every time in the morning after I get a very light spotting and then it ends? I'm new to this but I have taken pregnancy tests and all negative. So I don't know what I should do next? Any help guys please and thank you