WHAT COULD THIS BE?!?!?

Ge
Ok so I got off my period on the 2 and have been loightly spotting on and off since then and my last two day on my period turned pink and I haven't bleed in a whole day! And this morning I had so cramping and then this! FYI I've been doing the baby dance since the 27 and I am feeling a little off. And I conceived my last while I was bleeding. Could this just be from sex or maybe baby?