pregnancy tests, something isnt right i cant possibly be both pregnant and not pregnant at the same time

  OK so heres the low, i had my tooth pulled about 2 weeks ago, i legit used protection every time i had sex after that bc i couldnt take my bc bc of the hormone levels upped my chances of getting a dry socket, but it was fine bc we had condoms, one tim, just one fricken time i actually forgot i wasnt on the bill bc i been taking it for so long and it was towards the time i was about to get it refilled and start taking it again, i had sex but i honestly didnt think i was pregnant, but to be on the safe side i took a test the other day before getting back on the pill bc i didnt want to hurt the baby if i was, and that test was invalid, ok so i took another one that next morning, and it took a while first came up negitive then positive, idk if its bc i checked after the 10 mins was up or what, so i took another one later on that day,  same thing happend first neg then pos, so i bought yet another box, did hte same thing i did a night test and a morning test, the night test came up positive and the morning one (this morning) came up neg. 

THis has never happend to me before, I have 3 other childern, i am married so if i am pregnant its not a big deadl , i just wanted to be sure before i got back on the pill, and i waited THIS  long bc i should be getting my period on the 17th but i dont even know bc last month i didnt geti t until the very end of the month! i know i should go to a clinic but my husband will sorta get a hint of whats going on if i do that bc if it were to come back postive i wanna tell him on valentines day!  idk if anyone would know but advice would be great