Implantation bleeding?

Okay so I’ve been very very irregular since having my first baby. She’s now almost two and we have decided to try again. My hubby and I had sex the 27th and 28th of March then on our way home from out of town on April 3rd we stopped to use the bathroom and when I wiped there was light pink. Nothing on my panties or anything just when I wiped so I wiped one more time to make sure it was still there and it was so I put a tampon in. When we got home I went to change the tampon there wasn’t any sign of af or blood. I was also experiencing some horrible cramps when we stopped to use the bathroom could this have been implantation bleeding? This picture is pretty much what it looked like.