Help?? Advice please!

Rebecca • My hubby Mike and I have been married for 3 years. We welcomed Isabelle on 2/15/14 and are expecting baby #2 in 9/16!
So I am kind of nervous... Normally I don't get cramps earlier than about a week before my period (they're KILLER during my period because of endometriosis). This cycle I tracked things because my hubby and I decided we want to TTC #2. I ovulated on/around the 24th (currently about 5 DPO), and we BD the 24th, 25th, and 27th. Today I had cramps when I woke up and went to the restroom and had a tiny bit of pink spotting on the tp. It's gone away since then, but should I be worried? Wasn't sure what to think...