Tcc..really need help..

Ok so my hubby and I have been trying for 7 months now. . And my cycles are going from 26,27,28, ..however glow tells me I ovulate on day 14.. I'm think I ovulate later like maybe day 16... any who

Today (5/7/2015) is cd28 and no period, my doctor did run an hcg and it's only <2.4... so I don't know how to feel or think

can I be pregnant... anyone please help. .I did have Mirena in for about 2 years and had it take out in Oct 2014.