Not sure whats going on, need advice!

Jessica

Im currently late on my menstrual cycle by 15 days. I have done several pregnancy tests. With some coming up positive and some coming up negative. Well I ended up going to the ER and getting a urine test done there with it coming back negative. But here it is a week later and still no period... Me and my husband have been trying to conceive. So I got my IUD removed in November, leading to my first menstrual cycle being on December 14 after getting it taken out. I'm wondering if it is just my body trying to get back to a normal cycle considering I didn't have a period for 3 years with my IUD in. I don't know, I'm kind of panicking. What do you guys think?