I got my Mirena out 15 days ago and still no period?

So my husband and i didn't realize that we could become pregnant by having sex a week before i got the mirena out. I didn't bleed or anything when they took it out. We have been having sex and i can't stand to use condoms so the pull out method is the one we have been going off of. I have taken 3 pregnancy test none positive and i have been trying to calculate my ovulation but its difficult when i haven't had my period in over 18 months. I bought those home tests things for ovulation prediction but it say to wait for a period. What should i do...i feel like my boobs are getting bigger,darker around the nipple and my stomach is kind of bloating and i have had the hecups like crazy. Am i going insane? I do have a daughter who is 21 months so i no the symptoms im just confused! Thanks guys! serious answers only please