weird ovulation signs?

i had my implanon removed about 7 months ago as we want another child... since having it removed i swear i am getting reslly weird ovulation signs that i never used to get. One month i thought i was pregnant because i was so nauseas and tender in the (.)(.) and bloated, and having bizare spotting type cm (sorry tmi)... then i realised with the help of opks and temping that i was just ovualting. This has happend every month since... do others expereince similar things around o time? is it normal for your ovualtion "style" to change after each child... sorry if these are ridiculous questions but i am desperately trying to figure out my cycle so i can see my BFP sooner rather than later...

thanks in advance...

sam.